As the title says. I want you guys to list and explain (short analysis can work to) character/s from tv shows/movies/books/anime/manga/comics etc etc where their major popularity actually made the series they are in a better one. Without ruining the other characters/stories/plots etc etc!
I made this thread because as we have all seen. This ruined Naruto. And many other medias out there. Where the writers catered to the fans. Without caring for the story etc.
I'll start!
Spike from Buffy the Vampire Slayer! Not many people know this. But he was only supposed to be in a few episodes, and then killed of. So Angel can take the top spot. But his character gained such popularity, in such a short time. That Josh and writers decided to keep him on. And that was amazing decision. In the longer run. Spike brought much complex feel/story line to the show. And it was done without taking crap on everything else. It just felt normal. Like his storyline was planned from the start!