| Comet-san | Maeda Aki |
| Ra-Varumotto-Purovoone (Rababoo) | Kawata Taeko |
| Higenoshita | Ootake Hiroshi |
| Planet-Kingdom Harmonica's King [Ousama] (Comet's Father) | Iwata Yasuo |
| Planet-Kingdom Harmonica's Queen [Ouhi] (Comet's Mother) | Kokonoe Yumiko |
| Meteo | Honda Chieko |
| Muu-Vaitsen-Kuneederu (Muuku) | Nagasawa Nao |
| Planet-Kingdom Castanet's Ruling Queen [Joou] (Meteo's Mother) | Fukami Rica |
| Mira | Kobayashi Sanae |
| Karon | Kusaka Chihiro |
| Prince Planet | Ishikawa Shizuka |
| Tsukibito | Tenjin Umi |
| Henguriino | Satou Haruo |
| Ai | Takinoue Akiko |
| Mai | Tenjin Umi |
| Mii | Oonaka Hiroko |
| Commanding Officer Battabito | Satou Haruo |
| Problem-Solving-Bito | Kameyama Sukekiyo |
| Fujiyoshi Keitarou | Yamanoi Jin |
| Fujiyoshi Sayaka | Tominaga Miina |
| Fujiyoshi Tsuyoshi | Mamiya Kurumi |
| Fujiyoshi Nene | Matsuoka Yuki |
| Kazaoka Koujirou | Shinagawa Tooru |
| Kazaoka Tomeko | Kashii Kuniko |
| Mishima Keisuke | Asano Mayumi |
| Imagawa Shun | Shimowada Hiroki |
| Hiiragi Miho (Supika) (Comet's Aunt) | Ooba Kumiko |
| Hiiragi Shuuzou (Supika's Husband) | Kitagawa Katsuhiro |
| Rabapyon | Aoki Sayaka |
| Hani Kimiya (Panikkun) | Akari |
| Hani Shinya (Panikkun's Older Brother) | Tsumura Makoto |
| Hani Moeko (Panikkun and Shinya's Mother) | Mabe Shouko |
| Yuki-sensei | Kobayashi Sanae |
| Kyouko-sensei | Aoki Sayaka |
| Taichi | Kobayashi Sanae |
| Taichi's Mama | Tominaga Miina |
| Gen-chan | Saeki Tomo |
| Moriwaki Michiru | Tsumura Makoto |
| Kashima Hiroshi | Horie Hikaru |
| Maejima Yui [1] (ep.8) | Takahashi Mikako |
| Maejima Yui [2] (ep.26) | Saitou Eri |
| Hanamura Shiho | Matsutani Kaya |
| Manager Kuroiwa | Ooguro Kazuhiro |
| Kurata Asuka | Tanaka Sayuri |
| Takai Kiyoshi (Kiyocchi) | Kuwahara Toshiaki |
| Aoki | Shimizu Toshitaka |
| Aiko Kimihara | Sayuri |
| Miyamae-sensei | Hamano Yuuki |
| Ishidzuka-sensei | Kohara Masakazu |
| Batta-jin Eiseihei [Grasshopper-Man Orderly] | Nakamura Yuuichi |
| Cabinet Minister | Kinouchi Rikiya |
