| Seiyuu | Role |
| Yuuki Tai | Kai Kudou |
| Akeno Watanabe | Shinlu Bellvedia |
| Akimitsu Takase | Commander Eiji |
| Sanae Kobayashi | Asuka Tokugawa |
| Hisayo Mochizuki | Hikaru Kudou |
| Yasunori Matsumoto | Yuuki Tokugawa |
| Hiroshi Iida | Maxim |
| Akiko Hiramatsu | Maria |
| Junichi Suwabe | Leonid |
| Mahito Tsujimura | Erimiya |
| Yumiko Nakanishi | Sherry |
| Ayako Kawasumi | Ruri (Episode 1 - 4) |
| Reiko Takagi | Tsubaki (Episode 1 - 4, 24) |
| Hiroaki Miura | Chris (Episode 1 - 4, 24) |
| Fumihiko Tachiki | Naozumi (Episode 1, 11, 12, 21, 23, 26) |
| Yuko Mizutani | Hitomi (Episode 17, 20, 22 - 24, 26) |
| Yuka Imai | Gabrielle (Episode 15 - 17, 24, 26) |
| Ken Narita | Doctor Asakura (Episode 4, 14, 17, 23, 24, 26) |
| Naoko Matsui | Doctor Chigaya (Episode 4, 14, 17, 20, 23 - 25) |
| Jouji Nakata | Branded (Episode 6) |
| Kousuke Toriumi | Rick Webber (Episode 7) |
| Akeno Watanabe | Sarah (Episode 8) |
| Shinichirou Miki | Edgar Hanson (Episode 9) |
| Jun Fukuyama | Juma (Episode 11 & 12) |
| Misato Fukuen | Raphael (Episode 14 - 17, 19, 24, 26) |
| Akiko Hiramatsu | Aniel (Episode 15 & 16) |
| Makoto Yasumura | Rejin (Episode 11, 15, 16) |
| Yuuichi Nakamura | Teo (Episode 2, 4 - 9, 17, 22, 23) |
| Yasuhiko Kawazu | Balk (Episode 2, 5, 20, 21) |
| Mitsuki Saiga | Bud (Episode 20) |
| Reiko Takagi | Kai Kudou (as a child Episode 25) |
| Omi Minami | Juma (as a child Episode 12) |