Characters in Ufo Baby :
Main Characters :
 |
 |
| Miyu Kozuki | Kanata Saionji |
 |
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| Ruu | Wannya |
Supporting Characters :
- Pepo
- Miki Kōzuki
- Yū Kōzuki
- Hōshō Saionji
- Hitome Saionji
- Miu Saionji
- Christine Hanakomachi
- Momoka Hanakomachi
- Kurita Hanakomachi
- Santa Kurosu
- Nozomu Hikarigaoka
- Aya Konishi
- Nanami Tenchi
- Miss Mizuno
- The Principal
- Mikan Yamamura
- Mizuki Yamamura
- Akira Kijyou
- Seiya Yaboshi
- Rui Yaboshi
- Teru Moroboshi
- Durian
- Kiwi
- Guava