Along with HBO's The Wire, Lost has one of the best casts of characters ever assembled in a large mass. Each character had a back story that shows sides of them that expands their characters even more....truly unbelievable.....Each vote changes the ranks of your favorite cast members...so vote for your favorite.
http://www.ranker.com/list/best-of-lost-characters/david-steinsdoerfer,
Charlie Pace
Desmond Hume
Hugo "Hurley" Reyes
Jack Shephard
James "Sawyer" Ford
Jin-Soo Kwon
Richard Alpert
Sayid Jarrah
John Locke
Benjamin Linus
He was originally contracted to appear in just three episodes of Lost making his first appearance midway through the second season, in episode "One of Them". The producers were so impressed by him that they contracted him for a further five episodes, citing the scene at the end of "The Whole Truth" where Ben asks for milk as the moment they knew he was a "keeper"