1. Michael Keaton (either as himself or just him playing the character of Jacob but adlibbing the entire time)so technically still Jack and stays true to producer's word that he hasn't been cast yet. 2. Arvin Sloane. He knows more than anyone and swaps sides all the time. 3. Initially Ian Hart, but changes every season, was Kenneth Brannagh at some stage - possibly season 3? 4. A lonely war widow, overprotective of her children and is waiting for Christopher Eccleston to come home but Eloise Hawking knows the truth 5. Greg Grunberg. Just thought there wasn't nearly enough G's in this blog.
Feel free to add more.