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