Male Keronian Lance Corporal of the Keroro Platoon (Former elite assassin ninja) 55.55cm, 5.555kg with a blue body and blue eyes Never removes the mask covering his mouth and nose that he's worn since childhood (even while sleeping or eating). Loves nature and peace. Often lacks presence and speaks in an archaic, humble ninja style. Prone to crying but can be serious; his personality changes 180 degrees when he gets behind a steering wheel. Friends with Keroro, Giroro, Pururu, and Guest.

Male Keronian Sergeant of the Keroro Platoon 55.55cm, 5.555kg with a green body and black eyes Eccentric and lazy, but was once a legendary commander. Friends with Dororo, Giroro, Pururu, and Guest.

Female Keronian Chief Medical Officer 55.55cm, 5.555kg with a light purple body and purple eyes Kind and beautiful. Friends with Dororo, Keroro, Giroro, and Guest.

Male Keronian Corporal of the Keroro Platoon 55.55cm, 5.555kg with a red body and black eyes Gruff and stoic. Has a secret crush on Natsumi. Friends with Keroro, Dororo, Pururu, and Guest.

Male Keronian Private Second Class of the Keroro Platoon (The youngest) 55.55cm, 5.555kg with a dark blue body, black eyes, and a tadpole tail Admires Keroro. A bright and cheerful kid, but very prone to jealousy.

Male Keronian Sergeant Major of the Keroro Platoon 55.55cm, 5.555kg with a yellow body and wears spiral glasses Has a creepy 'ku-ku-ku' laugh, but is actually a genius hacker. Dislikes the pure-hearted Moa. Loves curry very, very, very much.

Female A ninja girl from a ninja village Long dark turquoise hair Dororo's partner

Female Angol Short blonde hair, light brown eyes, tanned skin, kind-hearted Loves Keroro Often ends her sentences with 'In other words, [Four-character idiom]?' or similar ad-libs.

Female Human Pink pigtails, brown eyes Strong and beautiful