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)