Male Keronian 51.5cm, 5.551kg A mature and diligent tsundere personality. Terrified of sea cucumbers and ghosts. Respects his father. Likes trains, the Galaxy Express, and Garuru. Possesses a Galaxy Express 999999 membership card. Childhood friends with Keroro and Zeroro. Image color is bright red. A trainee at the Keron Army Youth Training Center. Still has a tadpole tail because he is young. Dark red military cap.

Male Keronian 51.5cm, 5.551kg Timid, prone to crying, full of worries, and easily frightened. Often unintentionally bullied by Keroro. Despite this, he cherishes Keroro. Childhood friend of Keroro and Giroro. Light navy blue skin. Wears a mask covering his nose and mouth. Suffers from space asthma. Physically weak. Blue eyes. A trainee at the Keron Army Youth Training Center. From a wealthy family. Still has a tadpole tail because he is young. Yellow military cap.

Keronian 55.55cm, 5.555kg Red eyes. A legendary Corporal of the Keron Army. Strict and serious personality. Has fierce eyes, a straight mustache above his lip, and a double chin. Uses polite speech (honorifics) even toward Garuru and Giroro. Wears a belly band. Dark red skin. Close friends with Keroro's father. Light red military cap.

Ace trainee at the Keron Army Adult Training Center. 55.55cm, 5.555kg Sharp eyes and wears yellow goggles. Red eyes. Possesses a rigid, by-the-book military spirit. Serious and dignified tsundere. Giroro's older brother. Loves Giroro and likes it when Giroro calls him "Brother." Purple skin. Dark purple military cap.

Female Keronian 55.55cm, 5.555kg A bit clumsy but has a kind personality. Bright green skin. Black permed hair. Black eyes.

Male Keronian 55.55cm, 5.555kg A legendary Sergeant of the Keron Army. Strict yet kind personality. Close friends with Giroro's father. Straight mustache under his nose. Dark green skin. Black eyes.

Female Keronian 55.55cm, 5.555kg A legendary assassin of the Keron Army. Polite and kind personality. Navy blue skin. Wears a mask. Blue eyes.

Male Keronian 55.55cm, 5.555kg A free-spirited type who causes trouble for others, but is multi-talented in many fields. Has his own unique life philosophy. Close with Keroro, Giroro, and Zeroro. Speech style: "If I were to say what I think...", "Do you know the saying...?", "In other words, it's like this."

Female Keronian 51.5cm, 5.551kg Has a flower on the upper left of her pink military cap. Gentle and calm personality. Close with Keroro, Zeroro, and Giroro. Beautiful. Speaks casually. Light pink skin.

Male Keronian 50cm, 5.5kg Orange military cap, thermal earmuffs. Gloomy and wicked personality. Dislikes anything pure. Loves curry. Sucking on a yellow pacifier. Wears swirl glasses that completely hide his eyes. Extremely intelligent; despite being young, he has created various inventions and knows how to hack. Yellow skin. His skin was originally blue and his personality wasn't this gloomy, but he became this way after being buried in giant curry by Keroro.