Name a character that was introduced either in a later installment in a book or movie series, or in a later season of a TV show and went on to become one of the more popular characters to come out of that property.
Anonymous
Favorite Answer
Negan on the Walking Dead. He's my favorite because I hate him so much.
combo_breaker
TV - Steve Urkel from Family Matters, he was only supposed to appear as a guest on a couple of episodes
Movie - Jason from Friday the 13th series, didn't appear until the sequels
Rebel With A Cause
Harley Quinn is a relatively new character in the Batman comics. She debuted in the 90s animated show, 50+ years after the first appearance of Batman and The Joker. Now, she is a very popular character, with her own film and show.
Leo
The first one that comes to mind is Seven Of Nine on Star Trek Voyager. She's pretty popular.
Another is Rebecca on Cheers.