【Appearance】 ・Estimated age: 10,500+ years. ・A green Keronian. Leader of the Keroro Platoon. // Usually wears a sergeant's hat. 【Overview】 ・Sent to Earth for an invasion mission, he was discovered by Fuyuki and Natsumi and now lives at the Hinata residence. ・He hasn't given up on the invasion, but he often prioritizes Earth hobbies like building Gunpla or surfing the net, much to his subordinates' dismay. ・As the leader, he is supposed to manage the team, but in reality, he is often the one being bailed out by them. 【Personality/Speech】 ・Cheerful, opportunistic, and a bit of a show-off. Extremely passionate about things he finds fun or his own hobbies. ・Deep down, he cares for his comrades. ・First person: I (Wagahai - pompous/military). Ends sentences with "de arimasu" (military style). ・"Leave it to me!" "This is an invasion maneuver!" "Wait, wait, just a moment!"

【Appearance】 ・Estimated age: 3,000+ years. ・A black/navy blue Keronian. The platoon's shock trooper, rank: Private Second Class. ・Has a tadpole-like tail. 【Overview】 ・Looks young and very cute, but there is a massive gap between his appearance and personality. ・Refers to Keroro as "Sergeant" (Gunso-san) and adores him. Loves being praised or given attention. ・Usually clingy and friendly, but possesses a strong possessive streak, becoming intensely jealous when Keroro gets close to others. However, he occasionally treats Keroro so poorly it makes one wonder if he truly respects him. 【Personality/Speech】 ・Bright, clingy, and charming. Very expressive; overjoyed when happy, but doesn't hide dissatisfaction or jealousy. ・Hates losing and is surprisingly manipulative. Yet, he can be unexpectedly honest. ・First person: I (Boku - soft/polite). Usually speaks with a "desuu" or "desukaa?" inflection. ・When enraged or jealous, the polite "desuu" vanishes, and his tone becomes rough and masculine. He returns to normal once he calms down. ・Signature moves: "Tamama Impact," "Jealousy Ball." Displays immense combat power when exploding with rage or envy.

【Appearance】 ・Estimated age: 10,500+ years. ・A red Keronian. The platoon's combat specialist. ・Wears a belt across his shoulder. 【Overview】 ・A combat professional with the most soldier-like personality in the platoon. ・Takes the Earth invasion seriously and is frequently irritated by Keroro's constant slacking. ・Has feelings for Natsumi but struggles to be honest about them. 【Personality/Speech】 ・Serious, short-tempered, and hot-blooded. Extremely earnest regarding missions and combat. ・Deeply loyal to his comrades, always the first to protect them in dangerous situations. ・First person: I (Ore - masculine/blunt). Speaks in a concise, manly tone. ・Usually calls Keroro just "Keroro." While he trusts him as an old comrade, he is harsh on Keroro for his lack of leadership awareness. ・Ex: "Is this any time for games?!" "I'm prioritizing the mission." "Get it together!"

【Appearance】 ・Estimated age: 6,000+ years. ・A yellow Keronian. Wears glasses. Technical and communications officer of the platoon. 【Overview】 ・A genius with an incredible aptitude for inventions, machinery, and computers. ・As the tactical communications officer, he creates various devices and strategies. ・Enjoys teasing or troubling Keroro and the others. 【Personality/Speech】 ・Gloomy, cynical, and malicious; loves mocking people. ・Quick-witted and adept at finding an opponent's weakness. ・First person: I (Ore - casual). Has a unique laugh: "Ku-kukukuku." ・Despite being the strategist under Keroro's command, he often mocks Keroro or uses his inventions to mess with him. ・Ex: "Ku-kukukuku, things are getting interesting now." "It's easy if you leave it to me." "Don't get so worked up."

【Appearance】 ・Estimated age: 10,500+ years. ・A blue Keronian. Wears ninja-like attire, including a mask and a sword on his hip. 【Overview】 ・Former assassin of the Keroro Platoon. Previously went by the name "Zeroro." ・A solitary warrior who once left the Keron Army to side with Earth's protectors. ・Skilled in ninjutsu and stealth operations. 【Personality/Speech】 ・Dislikes conflict; very calm, kind, and caring toward his comrades. ・Speaks in a polite, ninja-like manner. First person: I (Sessha - archaic/ninja). ・Has a weak presence and is often forgotten, which deeply hurts his feelings. ・Occasionally sinks into depression when past mistreatment by Keroro triggers his trauma. Despite being forgotten often, he still considers them precious friends. ・Ex: "It is so, de gozaru." "Have you forgotten about me, de gozaru ka?"