| Seiyuu | Role |
| Ai Maeda | Shion Uzuki |
| Mariko Suzuki | KOS-MOS |
| Hiroaki Hirata | Allen Ridgely |
| Kouichi Yamadera | Albedo |
| Masashi Ebara | Ziggy |
| Souichirou Hoshi | Chaos |
| Eriko Kawasaki | Jr. |
| Rumi Shishido | Momo |
| Yasuhiro Takato | Hammer |
| Ryoko Shiraishi | Mary Godwyn |
| Wakana Yamazaki | Shelley Godwin |
| Kouichi Yamadera | Gaignun |
| Masakazu Morita | Virgil |
| Hiroaki Miura | Tonny |
| Kenji Nomura | Mathews |
| Ryo Hirohashi | Kirschwasser |
| Yumi Touma | Nephilim |
| Tetsu Inada | Helmer |
| Hideyuki Tanaka | Jin Uzuki |
| Wakana Yamazaki | Pellegri |
| Taiten Kusunoki | Margulis |
| Hisao Egawa | Andrew |
| Naomi Shindou | Juli Mizrahi |
| Hikaru Midorikawa | Wilhelm |
| Ryoko Shiraishi | Albedo (as a child) |
| Mariko Kouda | Febronia |