Yoshiko Matsuo
— Keroppi (voice)
伊倉一恵
— Den Den (voice)
深雪さなえ
— Teru Teru (voice)
峰あつ子
— Pika (voice)
西宏子
— Pikki (voice)
大竹宏
— Piero (voice)
青木和代
— Don (voice)
Kenichi Ogata
— Keroppa (voice)
富田耕生
— Max (voice)
Kyôko Yamada
— Kyorosuke (voice)
Mahito Tsujimura
— Meries (voice)
Masaki Maeda
— Koroppi (voice)
三浦雅子
— Keroleen (voice)
広瀬正志
— Hagetarō (voice)
柳沢三千代
— Noberun (voice)
真山亜子
— Goro (voice)
巴菁子
— Keroma (voice)
鈴木富子
— Junk (voice)
Tōru Furuya
— Athos (voice)
Chafurin
— Additional Voices (voice)
松尾銀三
— Additional Voices (voice)