1
Osamu Dazai - Bungo Stray Dogs
2
Overhaul - My Hero Academia
3
Olivier Mira Armstrong - Fullmetal Alchemist Brotherhood
4
Obito Uchiha - Naruto
5
Onyankopon - Attack on Titan
6
Obanai Iguro - Demon Slayer
7
Ochaco Uraraka - My Hero Academia
8
Ogai Mori - Bungo Stray Dogs
9
Orihime Inoue - Bleach
10
Okarun - Dandadan
11
Orochimaru - Naruto
12
Otabek Altin - Yuri!!! on Ice
13
Osamu Miya - Haikyuu!!
14
Oluo Bozad - Attack on Titan