It's possible he knew Ben, Richard and Eloise as they were all on the Island the same time he was. It's also likely he knew of the smoke monster aka The Man in Black.
Christian last saw his daughter when he visited her for the first time in many years when her mother was put into a coma after a car accident, he tried to persaude Claire to let her go but she refused. He tried to visit her sometime before his death but was not allowed Claire'a Aunt.
Christian met Ana Lucia at an airport in LA. He convinced her to fly to Australia with him as his bodyguard, she did so but they later went their seperate ways when Ana Lucia decided to return home to sort out her issues while Christian continued to stay in Australia and drink.
Boone and Shannon had met Paulo at the airport before boarding Flight 815. It's highly likely Boone had seen Paulo after this time too as he also survived the crash.
Boone was last seen speaking to Sayid when he approached Boone informing him that he and Shannon are getting closer. Boone warns Sayid away from her but he tells Boone he doesn't need his permission. This was the time when Boone also last saw Shannon on screen.
Locke had been with Boone when the beachcraft he was in fell from a cliff. Locke carried Boone to the caves but lied to Jack about how Boone had sustained his injuries. Locke then later vanished.
Both Jin and Charlie were told by Jack that he could not help Claire who was going into labour as he was trying to save Boone. He told them to tell Kate that she would have to guide Claire through it and also told them instructions on what to do.
Boone spent his last moments with Jack who had tried but could not save his life. Boone told Jack to "tell Shannon..." but he died before he could complete his last sentence.
Shannon was seen meeting Nikki after it was revealed Jack had a case of guns. It is also highly likely that she met Paulo too and that Shannon had seen them both again sometime before she had died.
It's likely Shannon saw all of them sometime before she died but it is unknown when as they were all busy spending most of their time in the Swan station.
Saw Walt mysteriously appear in the jungle, Shannon charged after him leading to her death. If the Walt she saw in the jungle was not Walt, then she last met Walt when he left on the raft.
Ana Lucia and Christian flew to Australia together so she could act as his body guard. They later went seperate ways when Ana Lucia decided to sort out her problems and go home whilst Christian decided to stay behind to drink. Later at the airport Ana Lucia over heard Jack talking about his deceased father, unaware that he was talking about Christian.
Ana Lucia along with Charlie and Sayid headed out to find Henry Gale's balloon in order to see if Ben was telling the truth about who he was. They discovered that he was lying.
Libby had met Ana Lucia early on the day they had both died, Ana Lucia told Libby that Ben had attacked her. Libby tells Ana not to do anything stupid.
Ana Lucia requested a gun from Sawyer but he wouldn't give her one. She later seduced him so she could then steal his gun from him in order to kill Ben.
Locke had rescued Ana Lucia earlier in the day when Ben attacked her. Ana Lucia last saw them when Michael returned to the hatch and told them that the Others aren't as powerful as they make out they are. Jack, Kate and Locke left to go and confront Sawyer for the guns leaving Ana in the hatch alone with Michael and Ben.
Last saw Ben when she handed him a knife in order to free himself, she however pointed a gun at him in an attempt to shoot him. But she couldn't bring herself to do so.
Michael persauded Ana Lucia to hand him the gun she had so he could kill Ben himself. However, as he had made a deal with the Others to release Ben to get his son back, he shot Ana Lucia and killed her instantly. He also shot and killed Libby when she walked in overseeing what he had done.
In the flash-sideways timeline Ana Lucia was a police officer who made a deal with Desmond to release himself, Kate and Sayid from imprisonment in exchange for money. Hurley asked Desmond if Ana Lucia was going to "move on" with them into the next life but Desmond told him that she wasn't ready to pass over and let go.
Libby met Desmond off-island in America. They had a cup of coffee together and Desmond told her he was going on a solo race around the world but was in need of a boat. Libby gives him the boat of her late husband, the Elizabeth. Coincidentally Desmond sailed back to the Island during Libby's funeral with that very boat.
Libby witnessed Bernard speaking to Boone over a radio and she heard his voice. By the time the tail section survivors merged with the other castaways Boone had died.
Most likely saw them a few hours before she died. Libby also helped Claire in remembering what happened to her when she was kidnapped by the Others. But it's highly likely Libby had seen and spoke to Claire afterwards as he death would not occur for several more days. Sun translated for Jin when she was looking for Hurley.
Met with Ana Lucia earlier on the day they had both died, Ana told Libby that Henry Gale had attacked her. Libby told Ana not to do anything stupid. Libby later walked in on Michael as he shot and killed her.
Last saw a seriously injured Libby under the care of Jack as Eko and Locke offered to go and hunt for Ben. Libby had passed away by the time Eko returned.
Nikki had likely met Jacob at some point in her life as she is listed as a Candidate. As Paulo's last name was never revealed he can't be assumed as a potential candidate.
They had met Ethan when he was pretending to be a survivor shortly after Flight 815 crashed. They most likely met him again sometime before he was exploited as a spy and killed.
Last saw Michael and Jack as they headed off to confront the Others. Jack was later captured by them and wasn't released until after Nikki and Paulo had died and Michael left the Island.
All of them presumed Nikki and Paulo were deceased and buried them alive. Rose and Bernard were not seen in the episode yet its highly likely they were present.
Michael last saw Jack, Kate and Sawyer after he betrayed them and left them captured in the care of the Others including Tom and Alex and left the Island with Walt.
Michael last saw his son as Walt looked through his window at the father he did no longer want to speak to after he confessed to killing Ana Lucia and Libby.
Last saw Frank and Sayid as they both left the Kahana the former on his helicoptor and the latter on a boat, both of them heading to the Island. Keamy ordered Frank to take him and his team to the Island.
Michael visited Hurley three years after his death as a ghost. He told Hurley that he needed to stop everyone from blowing up the plane otherwise it would get everybody killed. Hurley later saw Michael again who told him that the whispers were the sound of dead people who couldn't move on - including himself. He then told Hurley that if he ever sees Libby again then to tell her that he's very sorry for what he did.
In the flash-sideways timeline Charlotte was seen meeting and talking to all of them. She wasn't aware that she was dead and wasn't ready to move on. It's unknown when or if she ever did.
Last saw the Man in Black when he attacked the mercenaries in his Smoke form. It's also possible the "Christian" Locke encountered in "Cabin Fever" and "This Place Is Death" was the Man in Black as well.
Locke "moved on" to the next life with all of them.
Before his death Locke had never met Frank, Eloise, Penny or Ilana. He saw the Man in Black take on Christian's form, he saw Pierre on various orientation videos and he may of seen a young Eloise when he and his group were brought to the 50's.
Ironically, both Frank and Ilana were two of the four people at his funeral, despite never meeting.
Richard met Jacob originally in 1867, when Jacob made him immortal. Though further encounters have never been seen, it has been stated that Richard was the only Other to communicate with Jacob during Ben's rule from 1993-2007, so it can be inferred that Richard saw Jacob again after that.
Widmore stated that Jacob visited him shortly after his boat the Kahana sunk and informed him the error of his ways and told him everything he needed to know in order to bring Desmond Hume back to the Island.
Jacob apperared as a ghost to The Man in Black and Desmond as they headed to the well. Desmond asked The Man in Black if he knew who he was but he told Desmond to ignore him.
Jacob visted them all for the last time where he explained to them why he brought them to the Island and why Sun, Jin and Sayid died. He then made Jack his replacement to protect the Island.
Juliet last saw Horace as he was overthrown as the leader of DHARMA by Phil and Radzinsky who violently tried to force Sawyer and Juliet to tell them information about where and why Kate took the infant Ben.
Juliet, Kate and Sawyer last saw the three of them whilst running into them on their way to stop Jack from setting off Jughead, Bernard asked Juliet if she'd like to stay for some tea which she politely declined.
Ilana claimed Jacob was the closest thing she ever had to a father. She was last known to have seen Jacob at a hospital in Russia where he briefed her on how to protect the Candidates. She may have met or spoke to him after that however.
In the flash-sideways timeline Ilana worked as a Lawyer for Christian and Jack Shephard and Desmond Hume. Desmond introduced her to Claire Littleton who was in Christian's will and Jack and Claire met one another as brother and sister.
Sayid last saw them all before he left the Island, when he returned Michael and Charlotte had died and Daniel died shortly after he was captured by DHARMA. Rose, Bernard and Vincent as of the Incidnent were retired in a hut in the jungle, but still alive.
Sayid fought with Keamy when he and Kate were asked to rescue Ben and was almost a match for him but Keamy over powered him and almost killed him but Sayid was rescued by Richard.
Sayid and the rest of the Oceanic Six, Frank and Desmond were all saved by Penny on her boat. Sayid last saw her when he left his boat and got back to his life.
Sayid last saw Cindy before The Man in Black's faction were attacked by Widmore's team, as Cindy wasn't seen at the beach when many people were killed it's likely she is alive, it was revealed in "The Candidate" that those who survived scattered into the jungle.
Sayid was seperated from him when Sawyer locked him and Claire out of the submarine. The Man in Black put a bomb into Jack's backpack and intended for Sawyer to lock him out. The bomb did detonate, killing Sayid instantly.
Jin last saw Naomi as she along with Jack and Rousseau led the survivors to the radio tower. Jin stayed behind to kill the Others who planned to attack their camp, Tom was the last Other killed during the battle.
Jin was forced to leave Michael with the bomb on the Kahana when Michael told Jin to get to Sun and take her home. The bomb killed Michael but Jin escaped.
Jin last saw both of them before Locke stopped the time flashes, Locke left the Island and Charlotte died. Jin had made Locke promise not to bring Sun or his child back to the Island, however Locke died and Ben brought her back anyway.
Jin was seperated from him when Sawyer locked him and Claire out of the submarine. The Man in Black put a bomb into Jack's backpack and intended for Sawyer to lock him out. The bomb did detonate, sinking the submarine and trapping Sun behind wreckage.
They were all on the submarine with him as it was sinking, Jin was present when Sayid sacrafised himself and Jin stayed behind to try and free a trapped Sun.
Sun was seperated from him when Sawyer locked him and Claire out of the submarine. The Man in Black put a bomb into Jack's backpack and intended for Sawyer to lock him out. The bomb did detonate, sinking the submarine and trapping Sun behind wreckage.
They were all on the submarine with her as it was sinking, Sun was present when Sayid sacrificed himself and Jin stayed behind to try and free a trapped Sun.
The Man in Black took the form of the medusa spider which bit Nikki, and because he bit and paralyzed her both she and Paulo were assumed to be dead and were accidently burried alive.
The Man in Black last saw Locke alive during the attack of Keamy's Mercenary team at the barracks. When Locke's body was brought back to the Island shortly after his death The Man in Black took on his form and did so until the day he died.
The Man in Black last saw Ilana whilst she was standing guard and pacing the beach whilst Ben was being held captive by her. He tried to persaude Ben to escape and shoot her but the two ended up sorting their differences out and Ilana allowed Ben to stay with her group.
The Man in Black last saw Frank as he boarded Widmore's submarine along with Jack, Kate, Hurley, Sun, Jin, Sayid and Sawyer. The Man in Black's bomb he planted went off however Frank was one of the five who managed to escape.
The Man in Black caused all of them to die by planting a bomb into Jack's backpack which he took onto Widmore's submarine. Jack, Kate, Sawyer, Frank and Hurley managed to escape.
The Man in Black last saw Claire when he left her alone at Hydra Island and explained to her that he was going to finish what he started and kill of of Jacob's remaining candidates.
The Man in Black threatened to kill them both if Desmond did not leave with him. He left them alone when Desmond agreed to go along with him as long as he not harm them.
The Man in Black was shot by Kate and then pushed to his death by Jack. The Man in Black also stabbed Jack, but Jack didn't die until after he saved the Island from sinking.
He was however aware of who Penny and Christian were as he expressed to Charles Widmore that he would kill Penny should he ever leave the Island and he took on Christian's form many times.
Jack last saw them as he chased after Franks helicopter, he later left the Island and by the time he had returned Charlotte had died and Rose and Bernard had retired to a quiet life in the jungle.
Jack last saw them both when they decided to go and blow up the Ajira Plane to stop The Man in Black from leaving the Island while Jack decided to follow Hurley's decision to approach The Man in Black directly.
Jack last saw his sister Claire when she was locked out of the submarine. A day or so later Jack however urged Kate to leave him and make sure that Claire got on the Ajira Plane home, which she did.
Jack last saw Sayid, Jin and Sun when they were killed on Widmore's submarine due to The Man in Black's bomb, Frank survived however but was seperated from Jack, Sawyer, Kate and Hurley (the only other survivors) but he was found by Richard and Miles and he soon repaired the Aijra plane and flew Kate, Sawyer, Claire, Richard and Miles off the Island.
Jack pushed the Man in Black to his death after Kate shot him. The Man in Black stabbed him in the side before this, but Jack died after saving the Island from sinking.
Jack last saw them both as they headed for the Ajira plane whilst he decided to put the light back on in the source of the Island in order to save it. He said a friendly goodbye to Sawyer and shared a passionate emotional final goodbye to Kate.
Jack last saw them both as he prepared to die and sacrifice himself to save the Island, he made Hurley the next protector of the Island before he did so and Hurley soon hired Ben as his advisor and second in command.
Jack saw Desmond at the Island source where he tied a rope to him so that Hurley and Ben would rescue him, he told a reluctant Desmond to get home to his wife and son, when Desmond asked Jack what would happen to him Jack replied "I'll see you in another life brother".
After saving the Island, Jack was transported back into the jungle, he walked to the bamboo field where he first woke up on the Island and collapsed, Vincent ran up and laid down beside him as Jack saw the Ajira Plane carrying his friends off the Island, Jack shut his eyes and died with Vincent by his side.
Eloise persuaded Daniel to go to the Island, telling him that she would be proud of him if he did, knowing full well that her past self would shoot and kill him.
Eloise, along with Ben, managed to persuade Jack and Sun to return to the Island and gave them the details on how to get back. Desmond later turned up and warned them not to trust her.
Eloise last saw Widmore at the hospital after Desmond had been shot by Ben. They spoke about Daniel and Eloise slapped Widmore when he calls Daniel his son too. Widmore later died after returning to the Island.
Eloise knew them all and interacted with them all in the afterlife. She was aware of her life and asked Desmond not to awake her son as she didn't want to be departed from him, Desmond agreed.
Eloise would have been aware of Pierre as they were on the Island at the same time. It's also likely she knew of the smoke monster aka The Man in Black.
Rose presumably saw Boone a few hours before his death. Bernard spoke to Boone briefly over a walkie talkie just before the plane he was in fell from a cliff, causing the injuries that led to his death.
Rose last Cindy on the plane before the crash. Bernard last saw Cindy when she vanished in the jungle. As all three remained on the Island after the series' conclusion, it's possible they could have met again.
Though not seen in the episode it's highly likely that Rose and Bernard were among the survivors who believed a paralysed Nikki and Paulo were dead, leading them to bury them alive.
Rose and Bernard last saw Jack as he went into the jungle to chase the helicopter. He later left the Island and never saw Rose and Bernard when he returned; he later died saving the Island.
Rose and Bernard last saw them as travelled to the freighter. Sun eventually left the Island. By the time Jin returned and met up with the Oceanic 815 survivors Rose and Bernard were no longer with them as they were separated during the flaming arrow attack.
Rose and Bernard last saw them before they were separated during the flaming arrow attack. Charlotte died soon after, Daniel died three years later and Miles eventually left the Island.
Rose and Bernard last saw them as they were about to go and stop Jack from detonating Jughead. Juliet died soon after and Kate and Sawyer eventually left the Island.
Rose and Bernard last saw them when The Man in Black threatened to take Rose and Bernard's lives unless Desmond comes with him and does as he says. Despite Rose telling Desmond "he doesn't have to go anywhere with that man", he does so, but after making The Man in Black promise he will never harm them. The Man in Black later dies that day and Desmond eventually leaves the Island.
As Bernard and Rose remained on the Island it's highly likely that they would have seen Hurley as the new protector of the Island with Ben as his second in command. Walt was brought back to the Island by them and Vincent presumably remained in the care of Rose and Bernard until Walt returned.
Desmond met Libby in a café before they were on the Island. They had a coffee together and talked about their lives and Libby ended up giving Desmond The Elizabeth. Desmond and Libby never met on the Island, but Desmond did turn up on the boat during her funeral.
Desmond assisted Michael to try and freeze the bomb on the freighter but Michael ordered him to leave to save himself. The bomb eventually detonated, killing Michael.
Desmond would have last seen Frank as he left the boat to return to his life. Both Desmond and Frank would eventually return to the Island but they never saw each other there again.
Desmond discovered that Eloise was Daniel's mother when he went searching for her. He discovered Ben, Jack and Sun all at the church with Eloise and tried to persuade them not to trust her. He then left. Desmond never saw Sun again despite the fact they both returned to the Island. Sun eventually died.
Desmond last saw them when The Man in Black threatened to take their lives unless Desmond comes with him and does as he says. Despite Rose telling Desmond "he doesn't have to go anywhere with that man", he does so, but after making The Man in Black promise he will never harm them.
It's unknown when Penny last saw her Father as they appeared not to have a relationship. He returned to the Island to work for Jacob after changing his ways but he was later shot and killed by Ben.
Penny met Charlie briefly when her call was answered by the Looking Class station. Charlie drowned seconds later. Desmond and Penny eventually had a child and named him after Charlie.
Penny last saw them as they left her boat to return to civilization. Sayid, Sun and Jack later died after returning to the Island. As Kate managed to escape from the Island a second time and Hurley remained on the Island with Desmond at the end of the series' conclusion, it's possible Penny could have seen them two again.
Richard last saw a time jumping Locke when Richard gave him instructions on how to leave the Island and bring the Oceanic Six back to the Island. Richard believed he acted out of the instructions of the future Locke, unaware that The Man in Black was currently taking on Locke's form and he told Richard to tell Locke how to leave the Island, where he was killed.
Richard last saw them when they decided to go and confront The Man in Black whilst Richard, Ben and Miles leave to attempt to blow up the Ajira plane so The Man in Black can't leave the Island.
Richard last saw Widmore when they saw each other for the first time in years at the Other's village. Richard was later attacked and thrown into the jungle by The Man in Black. Ben was present when this occurred and it was the last time Richard saw him.
Ben last saw them as the castaways split into two groups. Ben decided to go to the barracks with Locke whilst Juliet and Jin remained behind with Jack's team.
Ben last saw them as he gave them a map to the Temple in order to ensure that they would take Alex there where they would be safe from Widmore's men. He left it too late however as Karl and Danielle were killed whilst travelling there and Alex was kidnapped.
Ben last saw Claire after the attack on the barracks by the Mercenary team, she left with Sawyer and Miles whilst Ben, Locke and Hurley left to find Jacob's cabin.
Ben last saw Penny as he set to shoot and murder her in revenge for her father's men killing his daughter, Alex. He then couldn't bring himself to go through it after seeing her son, Charlie.
Ben was present when Miles fled into the jungle to avoid The Man in Black and he then witnessed him throwing Richard into the jungle in his smoke form.
Ben acted as an advisor to Hurley who served as protector of the Island for an unknown amount of years. Ben and Hurley recruited Walt and brought him back to the Island.
In the afterlife Ben worked as a teacher at a school where Locke was a substitute teacher, Alex was his favourite student. Ben was later invited to dinner by Alex's mother Danielle. Upon discovering he was in the afterlife Ben apologised to Locke for killing him. He then said a final goodbye to Hurley, who he helped to run the Island with for presumably many years.
Claire's last meeting with Boone is unclear. She probably last saw him sometime after Charlie shot and killed Ethan. Boone was dying as Claire was giving birth to her son, Aaron.
Claire last saw Walt as he boarded the raft with Michael, Jin and Sawyer. He was later kidnapped by the Others and he then left the Island with Michael.
Claire's last meeting with Libby on screen was when she helped Claire to remember what happened to her whilst she was held captive by the Others. It's assumed however that she saw Libby and Ana Lucia the morning before they were murdered.
Claire last saw Michael soon after Ana Lucia and Libby's funeral. He left soon after with Jack, Kate, Sawyer and Hurley. He had escaped the Island less then a day later.
Claire last saw them when the Oceanic 815 survivors split into two groups. Claire left with Locke whilst Juliet, Desmond, Rose and Bernard stayed with Jack.
Claire was separated from them all when she was locked out of the submarine. Sayid, Jin and Sun all died when the Man in Black's bomb detonated as he planned, Jack and Hurley escaped but Claire never saw them again.
Claire escaped from the Island with Kate on board the Ajira Plane, it's assumed Kate helped Claire to raise Aaron as she promised once they arrived back in civilisation.
Frank last saw him as he decided to go and attempt to blow up the Ajira Plane whereas Frank joined Jack, Hurley and Sun to go and talk to The Man in Black.
Frank was seperated from him when Sawyer locked him and Claire out of the submarine. The Man in Black put a bomb into Jack's backpack and intended for Sawyer to lock him out. The bomb did detonate, a door knocked Frank in the head.
Kate last saw Ana Lucia as she left the hatch with Locke and Jack in order to get the guns from Sawyer, by the time they returned she had been shot and killed.
Kate probably last saw him before she left to confront the Others in an attempt to get Walt back. She was soon captured by them and by the time she returned Eko had died.
Kate last saw them both as they left the Island on a boat. Michael had betrayed her, Jack, Sawyer and Hurley and handed them over to the Others so that he and Walt could be reunited and then leave.
Kate probably last saw them both when she and Sawyer returned from being captured by The Others. She soon left with Locke and Sayid to go and rescue Jack, who was still held prisoner. When they returned both Nikki and Paulo had died.
Kate last saw them when she, Sawyer and Juliet came across their hut in the jungle. The three of them soon left them to stop Jack from detonating the hydrogen bomb.
Kate last saw them both during the battle at the swan work site. Pierre fled after injuring his hand. Kate and Sawyer tried to save Juliet's life as she was dragged down the drilling shaft. They were unsuccessful and she died soon after the group returned to 2007.
Kate was on the submarine with them all when The Man in Black's bomb detonated. She, Jack, Sawyer, Hurley and Frank managed to escape but Sayid, Jin and Sun all died.
Kate said an emotional goodbye to Jack as he left to save the dying Island. She last saw Hurley and Ben as they left with him whilst she and Sawyer headed towards the Ajira Plane in order to escape the Island.
Kate escaped from the Island with Claire on board the Ajira Plane, it's assumed Kate helped Claire to raise Aaron as she promised once they arrived back in civilisation.
Miles last saw a dying Charlotte as he, Locke, Juliet, Sawyer and Jin left her with Daniel in order to head to the Orchid station in an attempt to stop the violent flashes through time.
Miles last saw them both during the battle at the Swan work site. Pierre fled after injuring his hand and Juliet died soon after the group returned to 2007.
Miles last saw them when they split into two groups. Jack, Hurley and Sun were part of the group that decided to go and speak to The Man in Black whilst Miles left with Richard and Ben when they decided to use C4 to blow up the Ajira Plane in order to stop The Man in Black from leaving the Island.
Miles was Sawyer's partner in the police force. He arrested both Sayid, Kate and Desmond on separate occasions and set Sawyer up on a date with Charlotte who was friends with his father Pierre.
Sawyer met a seriously injured Mars after the crash when he shot him to put him out of his misery but his bullet missed his heart, forcing Jack to euthanize him.
Sawyer last saw Eko sometime before he, Kate, Jack and Hurley left to confront The Others with Michael. Sawyer, Jack and Kate were kidnapped and by the time Sawyer had returned to camp, Eko had died.
Sawyer last saw Michael and Walt as they were leaving the Island. Sawyer never saw them again as Michael died a few months later and by the time Walt was brought back to the Island, Sawyer had left.
Sawyer last saw them both at the meeting at Locke's house before Ben sent them to off to take Alex to The Temple for protection. However the three of them were ambushed. Rousseau and Karl were killed and Alex was apprehended. Sawyer, Claire and Miles later discovered their graves.
Sawyer last saw a dying Charlotte as he left her in the care of Daniel as he, Locke, Juliet, Jin and Miles left them behind to go to the Orchid station. By the time he returned to Daniel, Charlotte had died. It is possible Sawyer saw the younger Charlotte whilst living among the DHARMA Initiative.
Sawyer last saw Locke as he left the Island to bring back The Oceanic Six. However, he failed his mission and never got to return to the Island as he died.
Sawyer was on the submarine with them and Kate, Frank, Hurley and Jack when he accidentally set off The Man in Black's bomb. Sawyer, Jack, Kate, Hurley and Frank all managed to escape but Sayid died during the explosion after sacrificing himself whilst Jin stayed behind with a trapped Sun, they then drowned together.
Sawyer last saw them all as they prepared to head off for the source of the Island whilst he and Kate left to find Claire and to escape the Island on the Ajira plane. Sawyer said a friendly goodbye to Jack.
Hurley last saw Ana Lucia alive a few hours before she was murdered. Her ghost later visited Hurley off the Island to give him instructions on how to avoid the police.
Hurley last saw Michael alive when he betrayed him, Jack, Kate and Sawyer by leading them into a trap set by The Others. Michael's ghost visited Hurley after his death to try and prevent more people from dying. On the second visit Michael told Hurley he was trapped on the Island because of his cold blooded murder of Ana Lucia and Libby. Michael told Hurley that if he ever saw Libby again, then he wanted her to know that he was very sorry. Hurley later brought Walt back to the Island in an attempt to help Michael.
Hurley last Mr. Eko when he and Charlie saved him from a fire in his tent. Eko was beaten to death by The Man in Black a few hours later. After leaving the Island, Hurley implied that Eko's ghost had visited him but this wasn't shown on screen.
Hurley said an emotional goodbye to his friend Charlie as he left for the Looking Glass Station, where he later died. Charlie later visited Hurley as a ghost to try and convince him to return to the Island.
Hurley last saw them as they left to try and stop The Incident from taking place. Hurley never saw them again as the group were transported back to 2007, whilst Pierre remained in the 1970's and Juliet had died due to her injuries from falling down the shaft.
Hurley last saw Claire on screen when Sawyer locked her and The Man in Black out of the submarine. As Claire later left the Island with Kate and Sawyer, it's possible that Hurley could have visited her off the Island, but it was never shown.
Hurley was on the submarine with them when The Man in Black's bomb detonated, destroying the submarine. Hurley managed to escape along with Jack, Kate and Sawyer but Sayid, Sun and Jin all died. Frank also managed to escape but this was the last time Hurley saw him.
Hurley last saw them on screen as they left to get on the Ajira plane which took them off the Island. It's possible that Hurley could have visited them off the Island but this has never been shown.
Hurley last saw Jack as he and Ben lowered him down to the heart of the Island to save it from dying. Jack succeeded in his mission but later died soon after. It's likely Hurley came across his body and gave him a funeral.
Hurley presumably served as leader of the Island with Ben as his second in command for many years. Ben and Hurley also brought Walt back to the Island, it's possible that Walt eventually became Hurley's replacement.
A vision of Walt appeared to Sayid and Shannon in the jungle seconds before she was accidentally shot and killed. His appearance was never explained. It could have been The Man in Black. If it wasn't Walt then he would have seen them last as he boarded the raft.
Walt last saw his father Michael off the Island as he attempted to visit him but Walt didn't want anything to do him after finding out that he killed two innocent women in order to get him back. Michael later began to work for Ben Linus as a spy on Charles Widmore's freighter, he later died there.
Locke visited Walt when he left the Island in his mission to get the Oceanic Six to return. Locke was also going to try and get Walt to return with him but decided against it as he Walt had suffered enough.
Walt was brought back to the Island by Ben and Hurley and presumably spent many years on the Island with them. It's also very likely Walt was reunited with Vincent, who was in the care of Rose and Bernard as the series concluded.
Ben last saw Horace shortly before the Purge which ended his life which was seen in the episode "The Man Behind the Curtain", Sawyer and Juliet last saw Horace in the 70's as he tried to protect them from being beaten up by other DHARMA members when they found out it was them who kidnapped an injured Ben as a child and handed them to the Others in the episode "The Incident, Part 2" and Locke saw Horace in a dream which helped him to locate Jacob's cabin in the episode "Cabin Fever".
Kate last saw a dying Mars, the man who had been chasing her for years in the episode "Tabula Rasa" where she talked to him and asked Jack to put him out of his misery but Jack refused to murder him. Kate convinced Sawyer to shoot him to end his life but he missed his intended target, the heart and hit his lungs instead. As it would of taken him hours of pain before he would eventually die Jack euthanized Mars.
Ethan posed as a survivor of Flight 815 and got to know Nikki and Paulo which was seen in the episode "Exposé", Ethan later captured Claire and when she managed to escape he told Charlie that he wanted her back and if he didn't get her back then somebody would be killed by sundown every day until he did. He was lured into a trap however and Claire, Kate, Sawyer, Locke, Jack and Sayid were all present when Charlie grabbed a gun and shot Ethan dead in the episode "Homecoming".
Tom kidnapped Walt from the raft in the episode "Exodus, Part 2. Tom last met his leader Ben sometime before he left with a large group of Others to kidnap the women from the 815 survivors beach in the episode "Greatest Hits". Tom spoke with Jack over a radio in the episode "Through the Looking Glass" where Jack believed that Tom had murdered Jin, Bernard and Sayid when they infact just shot into the sand instead of actually killing them and Jack told Tom that he will kill him. In the same episode Juliet, Hurley and Sawyer rescued Sayid, Jin and Bernard by ambushing Tom and the remaining Others. Tom as the last one standing gave in but was shot dead by Sawyer anyway.
The Science Team consisting of Daniel, Charlotte, Miles and Frank all last saw Naomi before she flew to the Island and she had died by the time they arrived, Naomi last saw Desmond and Charlie two people who helped save her life in the episode "Greatest Hits" when they left for the Looing Glass Station, Locke saw Naomi in the episode "Through the Looking Glass" where he threw a knife in her back to stop her from contacting her people and Kate tracked a bleeding Naomi down in the episode "The Beginning of the End" where Kate watched as she died.
Karl let saw Kate when he left with Locke's faction whilst she stayed behind with Jack in "The Beginning of the End" and he last saw Ben, Claire, Sawyer, Miles, Hurley and Locke during a meeting at Locke's house where Ben persauded him and Danielle to take Alex to the Temple where they'd be safe from an attack from Widmore's men. However Karl and Rousseau were killed on their way there by the very same people Ben was trying to protect them from and Alex was captured in the episode "Meet Kevin Johnson".
Danielle last saw the first Oceanic Flight survivor she had ever met Sayid and Kate when she was part of the plan to capture Sayid, Kate and Miles who had entered the barracks where Locke's group were staying in the episode "The Economist", Danielle last saw Claire, Hurley, Sawyer and Locke in the episode "Meet Kevin Johnson" after a meeting at Locke's house where Ben warned her, Alex and Karl to leave the barracks and head to the temple for safe refuge as he knew an attack from Widmore's team was coming however Danielle and Karl were killed by them on their way there and Alex was taken hostage anyway.
Alex last saw Juliet in the episode "The Beginning of the End" they hugged each other upcon seeing one another but Alex later left with Locke's faction whilst Juliet stayed with Jack. Locke, Miles, Sawyer, Claire, Hurley and her adoptive Father Ben watched as Keamy held her at gunpoint during the attack on the Others barracks in the episode "The Shape of Things to Come" where Ben was told by Keamy to leave the house to save Alex, he refused however and to his horror Alex was shot dead.
Sayid last met Keamy when the two had an agressive fight almost resulting in Sayid's death before he was saved by Richard in "There's No Place Like Home, Part 3" and in the same episode Ben stabbed Keamy in revenge for killing his daughter and both he and Locke were present when Keamy died and Michael last saw Keamy as he left the Kahana after murdering Captain Gault and the ships doctor Ray in cold blood in the episode "Cabin Fever".
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