| Seiyuu | Role |
| Hekiru Shiina | Hikaru Shidou |
| Konami Yoshida | Umi Ryuuzaki |
| Hiroko Kasahara | Fuu Hououji |
| Emi Shinohara | Sierra (Second Season) |
| Yuri Shiratori | Primera (Second Season) |
| Miki Itou | Nova (Second Season) |
| Kiyoyuki Yanada | Geo Metro (Second Season) |
| Junichi Kanemaru | Zazu Torque (Second Season) |
| Chinami Nishimura | Asuka (Second Season) |
| Satomi Koorogi | Sang Yung (Second Season) |
| Yukimasa Kishino | Lafarga |
| Atsuko Takahata | Debonea (Second Season) |
| Juurouta Kosugi | Lantis (Second Season) |
| Megumi Ogata | Eagle Vision (Second Season) |
| Nozomu Sasaki | Clef |
| Megumi Ogata | Princess Emeraude |
| Juurouta Kosugi | Zagato |
| Takumi Yamazaki | Ferio |
| Minami Takayama | Ascott |
| Yuri Amano | Alcyone |
| Yuko Nagashima | Cardina |
| Yuri Shiratori | Mokona |
| Aya Hisakawa | Tarta (Second Season) |
| Kikuko Inoue | Tatra (Second Season) |
| Saeko Shimazu | Narration (Episode 2 - 20) |
| Hideyuki Tanaka | Rayearth |
| Akio Ohtsuka | Windam |
| Tessho Genda | Ceres |
| Yuka Imai | Mira |
| Ryoutarou Okiayu | Innova (Episode 1 - 3, 5, 6, 9, 15, 17) |
| Emi Shinohara | Presea (Episode 2, 6, 9, 14) |
| Miki Itou | Umi's Mother (Episode 21) |
| Kaneto Shiozawa | Umi's Father (Episode 21) |
| Nobuo Tobita | Satoru Shidou (Episode 21) |
| Isshin Chiba | Masaru Shidou (Episode 21) |
| Masami Kikuchi | Kakeru Shidou (Episode 21) |
| Satomi Koorogi | Sera (Episode 15) |
| Yumi Touma | Ferio (as a child Episode 17) |
| Yumi Touma | Hasegawa-senpai (Episode 9) |
| Yuko Kobayashi | Sora Hououji (Episode 21) |