I really do not have a favorite anime character. But if I have to think about someone I would like to talk about for this post it would be Hanamichi Sakuragi from Slam Dunk.
Why?
For the development that the author gave him. At the beginning of the series, he is just a tall boy who lives failures in romantic relationships. But after immersing himself in the world of basketball he finds something that he really loves, at first motivated by his rivalry with Rukawa, but finally acting out of the simple desire to play and win in the sport he loves. Even if that meant cooperating with Rukawa.