Main
| Yusuke Urameshi | (Kazuma) Kuwabara |
| Kurama (Shuichi Minamino and Yoko) | Hiei |
| Botan | Keiko Yukimora |
| Koenma | Yukina |
| Shizeru Kuwabara | Genkai |
| Puu | Blue Ogre |
| Toguro (season 2) |
Selected minor/supporting characters
| Atsuko Urameshi | Mr. Takanaka | Jin |
| Touya | Suzuka | Shishi |
| Chu | Rinku | Koto |
| Juri | Elder Toguro | Bui |
| Karasu | Sakyo |
Note: All ages are given from the beginning of the series unless otherwise stated.