Yoshiko Matsuo

as Keroppi (voice)

Kazue Ikura

as Den Den (voice)

Sanae Miyuki

as Teru Teru (voice)

Atsuko Mine

as Pika (voice)

Hiroko Nishi

as Pikki (voice)

Hiroshi Otake

as Piero (voice)

Kazuyo Aoki

as Don (voice)

Kenichi Ogata

as Keroppa (voice)

Kosei Tomita

as Max (voice)

Kyôko Yamada

as Kyorosuke (voice)

Mahito Tsujimura

as Meries (voice)

Masaki Maeda

as Koroppi (voice)

Masako Miura

as Keroleen (voice)

Masashi Hirose

as Hagetarō (voice)

Michiyo Yanagisawa

as Noberun (voice)

Ako Mayama

as Goro (voice)

Seiko Tomoe

as Keroma (voice)

Tomiko Suzuki

as Junk (voice)

Toru Furuya

as Athos (voice)

Chafurin

as Additional Voices (voice)

Ginzo Matsuo

as Additional Voices (voice)