| Seiyuu | Role |
| Hiro Shimono | Agate Fluorite |
| Jun Fukuyama | Beryl Jasper |
| Daisuke Kishio | Fon Aina Sulfur |
| Mitsuki Saiga | Vesuvia Valentino |
| Hidenobu Kiuchi | Hematite Ramsbeckite |
| Hiroyuki Yoshino | Chrome |
| Masashi Ebara | Chalce's Father (Episode 15 & 16) |
| Iemasa Kayumi | Roberto (Episode 14 , 17, 23 - 25) |
| Fujiko Takimoto | Chalce (as a child Episode 13, 15, 16) |
| Youko Honna | Lina (Episode 12 & 13) |
| Ikuko Tani | Chalce's Grandmother (Episode 9, 10, 16) |
| Chihiro Suzuki | Chrome Team's No.2 |
| Takaya Hashi | Ramsbeckite (Episode 4 & 12) |
| Eiji Maruyama | George (Episode 2, 6, 11) |
| Hiroshi Kamiya | Rhodo Chrosite |
| Tatsuhisa Suzuki | Chrome Team's No.1 |
| Miyuki Ichijou | Lina's Mother (Episode 13) |