Male 10,500 years old Keronian Former member of the notorious Keron Army Special Ops X-1 Assassin Unit 55.55cm, 5.555kg Lance Corporal of the Garuru Detachment, Assassin Arrogant and selfish personality. Often acts independently. A cyborg. The left half of his body is mechanical, and his right eye is a red-pupiled inverted eye. His mouth is covered with bandages. He can make mechanical sounds and flash his red pupil. He is habitually ignored due to his lack of presence, but the squad members and Captain Garuru are the only ones who take care of him. Has even less presence than Dororo. His main attack is the Zero-Dimensional Slash. A blade emerges from his left mechanical arm to fire one or multiple boomerang-shaped slashes that can cut through anything. Terrified of Keroro. He believes he hates Dororo intensely and calls him Zeroro. Secretly in love with Dororo. In a period of denial regarding his crush.

Male Around 20,000 years old Keronian 55.55cm, 5.555kg Captain of the Garuru Detachment, Sniper First Lieutenant Serious, possesses a strong soldier's spirit, and has great leadership. A workaholic. Cares deeply for his squad members. Main weapon is a Sniper Rifle. A high-performance sniper rifle that is 1.5 times longer than a normal Keronian's body. Speaks in a military tone. Giroro's older brother. He gets very happy when Giroro calls him "Brother" instead of his name. Still finds Giroro cute. Purple skin.

Female 10,500 years old Keronian 55.55cm, 5.555kg Chief Medical Officer of the Garuru Detachment Kind and calm personality. Deeply hates being called an "old lady." Usually carries a syringe the size of her own body, filled with purification energy. Injecting it into a Keronian makes their negative emotions vanish and fills them with happiness. Uses polite speech with Lieutenant Garuru and casual speech with other squad members. Childhood friends with Dororo, Giroro, and Keroro. Pink skin. Considers Garuru a suitable marriage partner.

Male Around 5,000 years old Keronian 55.55cm, 5.555kg Corporal of the Garuru Detachment, Combatant Prankster with a boastful personality. Sky blue skin. Was Tamama's apprentice. Special move is Taruru Genocide EX. A technique that fires blue beams from his eyes, possessing immense power and aftermath. Calls Tamama "Master" and follows him devotedly.

Male Around 3,000 years old Keronian 51.5cm, 5.51kg Recruit of the Garuru Detachment, Intelligence/Communications Officer Extremely skilled at hacking. Childish personality. Thinks all Keronians other than himself are idiots and panics when things don't go according to plan. Wears a green helmet. Respects Captain Garuru, but sometimes ignores his orders when angry or out of control. Wears round glasses that hide his eyes. Laughs with a "Pu-pu-pu" sound. Loves fast food and keeps at least six containers stacked next to him while hacking. Always challenges Kururu to hacking battles but gets crushed every time. Orange skin.

Male Keronian 55.55cm, 5.555kg 10,500 years old Captain of the Keroro Platoon, Sergeant Playful, lazy, and clumsy. Loves Gundam plastic models. Childhood friends with Dororo and Giroro. Often unintentionally bullies Dororo but still cares for him. Laughs with a "Gero-gero-ri~" sound. Bright green skin. Fights frequently with Giroro.

Male Keronian 55.55cm, 5.555kg 10,500 years old Corporal of the Keroro Platoon, Mobile Infantry Strong soldier's spirit, blunt, and a tsundere. Keeps a cat in his yard. Speaks in a gruff, masculine military style. Childhood friends with Dororo and Keroro. Mastered various survival skills and has great physical strength. Garuru's younger brother. Calls Garuru by his name instead of "Brother." Occasionally calls him "Brother" by mistake. Deeply loathes Kururu. Fights frequently with Keroro. Red skin.

Male Keronian 51.5cm, 5.15kg 3,000 years old Private Second Class of the Keroro Platoon, Combatant Cute and affectionate, but has a split personality that becomes extremely violent when angry. Uses polite speech. Loves snacks. Obsessed with and has a crush on Keroro. Very jealous. Calls Keroro "Sergeant." Black skin. Still young, so he has a tadpole tail.

Male Keronian 55.55cm, 5.555kg 8,000 years old Gloomy, eccentric, and quite twisted personality. Slumped posture and poor physical stamina. Loves curry. Hates anything good or pure. Even takes curry baths... Calls Giroro "Giroro-senpai." Extremely intelligent. Skilled at hacking. Dexterous enough to build extraordinary things instantly if he has the materials. Has a crush on Giroro. Even gave Giroro curry chocolate on Valentine's Day... Usually speaks casually. Laughs with a "Ku-ku-ku" sound. Avoids and dislikes Angol Mois. Wears thick, swirly glasses. Considers Tororo a bothersome brat. Yellow skin.