| Name | Total | ... |
|---|---|---|
| Oda Nobunaga | 9 | GO |
| Odion Ishtar | 1 | GO |
| Oerba Dia Vanille | 5 | GO |
| Oerba Yun Fang | 3 | GO |
| Off The Hook | 0 | GO |
| Officer Jenny | 4 | GO |
| Ohana Matsumae | 5 | GO |
| Oichi | 3 | GO |
| Ojou | 4 | GO |
| Oka Nishizawa | 2 | GO |
| Ōka Yūōji | 1 | GO |
| Okamura | 1 | GO |
| Okinami | 1 | GO |
| Okumura Rin | 4 | GO |
| Okumura Yukio | 2 | GO |
| Olcadan | 1 | GO |
| Oleana | 1 | GO |
| Olga Marie Animusphere | 3 | GO |
| Oliver | 3 | GO |
| Olivia | 1 | GO |
| Olivia (Pokemon) | 1 | GO |
| Olivier Mira Armstrong | 4 | GO |
| Olminu | 0 | GO |
| Omar al-Bashir | 1 | GO |
| Omiko Hakodate | 3 | GO |
| One | 1 | GO |
| One-san (Penguin Highway) | 0 | GO |
| Onimaro | 1 | GO |
| Onna Kishi | 6 | GO |
| Onna Mahoutsukai | 1 | GO |
| Onodera Haru | 4 | GO |
| Onodera Kosaki | 16 | GO |
| Ononoki Yotsugi | 9 | GO |
| Onozuka Asahi | 4 | GO |
| Onpu Segawa | 2 | GO |
| Onsa Amano | 3 | GO |