The troublemaking Sergeant... but he's turned into a child. He's a dummy. (He's cute.)

The crybaby Lance Corporal... but he's turned into a child. He is truly adorable. His childhood name was Zeroro. (You may call him Zeroro.) He usually uses archaic speech, but he doesn't as a child.

The gloomy Major. He did not turn into a child.

The cute, double-faced youngest Private Second Class. He did not turn into a child.

A human. Giroro's partner. She calls Keroro [Stupid Frog]. She did not turn into a child.

Natsumi's younger brother. A human. Keroro's partner. He did not turn into a child.