1
Osamu Dazai - Bungo Stray Dogs
2
Olivier Mira Armstrong - Fullmetal Alchemist Brotherhood
3
Osamu Miya - Haikyuu!!
4
Overhaul - My Hero Academia
5
Okarun - Dandadan
6
Orion - Amnesia: Memories
7
Ogun Montgomery - Fire Force
8
Obito Uchiha - Naruto
9
Orihime Inoue - Bleach
10
Oushi Ashioki - A Sign of Affection
11
Obi - Snow White with the Red Hair
12
Obanai Iguro - Demon Slayer
13
Onyankopon - Attack on Titan
14
Ogai Mori - Bungo Stray Dogs
15
Oluo Bozad - Attack on Titan
16
Ochaco Uraraka - My Hero Academia
17
Otabek Altin - Yuri!!! on Ice
18
Orochimaru - Naruto
19
Otohime - One Piece