Don't forget that the entire Danganronpa series is eligible.

I still struggle with 2 vs V3 for my fav. Both are in my top 5 all time games. At the end of the day I really think I have to go with V3, it's just super tough because of a few specific characters I so thoroughly love in 2 (Ibuki, Fuyuhiko, Nagito, Gundam, Hajime is the best protag no question), but the consistency is so much higher in V3. My least favorite V3 character I like more than at least 5 characters in the 2 cast, similar to how I like barely anyone in DR1 more than even my lower DR2 picks.