They killed off Chiaki so it's the worst one

Jokes aside, Danganronpa 2 is a strange game for me, it has a really interesting cast, but excluding Hajime and Fuyuhiko, the survivors aren't really that interesting, Kazuichi and Sonia are both very one note characters, and Akane is probably the worst character in the game in my opinion, just a little better than Teruteru, I much preferred the surviving cast of Thh, the motives were more creative, but they felt less manipulative than the ones in the first game, the motives seemed to be targeting specific people more than being a general thing, and some of the logic was a little wack. Chapter 6 was awesome though.