First Lieutenant A taciturn and cold soldier type. Giroro's older brother.

Recruit Laughs with a 'pu-pu-pu' sound. A similar type to Zoruru; he hates Kururu and tries to crush him, but he's always beneath Kururu no matter what. Has a bratty, immature personality.

Chief Nurse (Her rank is Chief Petty Officer, but this is the title used when she's performing nursing duties) Usually kind and gentle, but if she hears the words 'old lady' or 'ma'am,' something inside her snaps and she starts muttering to herself.

Sergeant Childhood friends with Giroro and Dororo. It's a Pekopon invasion, sir~~!! As a Sergeant, he speaks informally to everyone. He lives at Natsumi and Fuyuki's house, calling them 'Lady Natsumi' and 'Master Fuyuki.' Human partner - Fuyuki Hinata

Corporal Childhood friends with Keroro and Dororo. He considers Keroro pathetic for neglecting the Pekopon invasion. Garuru's younger brother. Deeply sincere and diligent. Speaks informally. Human partner - Natsumi Hinata

Private Second Class Follows everything Keroro says. Speaks politely. 'Sergeant Keroro~' 'Corporal Giroro~' And so on. Human partner - Momoka Nishizawa

Sergeant Major Laughs with a 'ku-ku-ku' sound. He knows Tororo hates him, so he occasionally teases him by mimicking what Tororo says. Gloomy and eccentric. Speaks informally. Human partner - Mutsumi Saburo

Lance Corporal X-1 Unit Assassin The type whose personality flips the moment he grabs a steering wheel. Childhood friends with Keroro and Giroro. Wears a mask (won't take it off for his life). Uses archaic/ninja speech (gozaru style). Has zero presence. Ninja. Subject to one-sided hatred from Zoruru. Human partner - Koyuki Azumaya (Dororo calls her 'Lady Koyuki').