I know people are rioting at the fact I don't have Katsuki as #1, but let me state my case. When the show first started, I couldn't stand Katsuki; his bullying and constant outbursts made me wish for the day that Izuku would just destroy his life in battle, but then little by little the show fleshed out his story more and more. We saw that as the battles continued he started realizing that not only could he depend on his comrades for help, but could use some of them as motivation to be better, in particular Izuku. Now although that's a fine arc to have, I enjoyed others just a little bit more. His outbursts now add to the comedy of the show, especially if he's with Eljiro, who knows how to handle him the best. I'm excited for where the show takes his arc and can't wait to see more.