| Seiyuu | Role |
| Takumi Yamazaki | Isamu |
| Rika Fukami | Myung |
| Unsho Ishizuka | Guld |
| Megumi Hayashibara | Lucy |
| Tomohiro Nishimura | Jan Neumann |
| Kenji Utsumi | Millard |
| Shou Hayami | Marge |
| Banjou Ginga | Raymond |
| Mako Hyoudou | Sharon Apple |
| Norio Wakamoto | Dr. Worth |
| Urara Takano | Kate |
| Yuusaku Yara | Morgan |
| Yasunori Masutani | Young Guld |
| Yasunori Masutani | Dr. Worth (Movie Version) |