Anime with the best character development?

I'm looking for a show with really good character development where we can watch characters grow as the story goes. The only thing is I don't wanna watch anything that's more than 100 episodes like One Piece. Nothing against them, but I only have time to watch about 2 episodes a day and I don't wanna spend that many days on the same show.

Actually I lied. This thread is actually a trap to see how many people don't read the body of text and just commend "One Piece" anytime they see a prompt that slightly relates to it