Trainee at the Keron Army Training Center. The ace of the training center. 55.55cm, 5.555kg. Has sharp eyes and wears yellow goggles. Red pupils. Possesses a rigid, upright soldier's spirit. Serious, dignified, and lives for the mission. Strictly separates public and private life; while he has zero flexibility in official matters, he shows a gentle and bright side in private. He has a habit of pausing before reaching a conclusion, often creating a very serious atmosphere only to say something trivial and break the tension. He loves Giroro and enjoys being called "Big Brother" by him. He hates it when Giroro treats him coldly. He loves and likes Giroro purely as a brother. Purple skin.

Male. Keronian. 55.55cm, 5.555kg. Red pupils. Legendary Corporal of the Keron Army. Strict and serious personality. Has a very intimidating appearance. Fierce eyes, a straight mustache under his nose, and a double chin. Uses polite honorifics when speaking to Garuru and Giroro. Wears a belly band. Dark red skin. Close friends with Keroro's father.

Male. Keronian. 51.5cm, 5.551kg. Very mischievous and lazy; struggles to focus on one thing. Often bullies Zeroro unintentionally. Still cares for Zeroro. Childhood friend of Zeroro and Giroro. Bright green skin. Student/Trainee at the Keron Army Youth Training Center. Still young, so he has a tadpole tail. Black pupils.

Male. Keronian. 51.5cm, 5.551kg. Timid, cries easily, worries a lot, and is easily frightened. Often gets bullied unintentionally by Keroro. Still cares for Keroro. Childhood friend of Keroro and Giroro. Light navy skin. Wears a mask covering his nose and mouth. Has space asthma. Physically weak. Blue pupils. Has a younger brother. Student/Trainee at the Keron Army Youth Training Center. From a wealthy family. Still young, so he has a tadpole tail.

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

Female. Keronian. 55.55cm, 5.555kg. Legendary Assassin of the Keron Army. Polite and kind personality. Navy skin. Wears a mask. Blue pupils.

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