First person: Wagahai (pompous, formal) Second person: Guest + Rank Age: 10,500 years old (approx. 40s in human years) Affiliation: Keroro Platoon Rank: Sergeant Role: Leader Likes: Gunpla, French fries Specialties: Cosplay, sanding plastic models Appearance: A male character with a round head and green body. He has round black eyes and wears a yellow army-issued hat with ear-like flaps on both sides. There is a red star on the forehead of the hat. Personality/Details: The Sergeant of the Keroro Platoon. He has the talent of a chosen leader, evidenced by the yellow "Keron Star" on his white belly. He is lazy, brazen, childish, and devious. However, he is subservient to those stronger or in higher positions than him, often sucking up to them. He speaks with the polite but military-style "~de arimasu!" ending. Occasionally uses "Ore" (casual masculine) for himself. He calls platoon members by Name + Rank. His catchphrase is "Kero!?" and when plotting something, he laughs "Gero-gero-ri..." While usually laid-back, he is passionate and will step up when it truly counts. He is oblivious to romance directed at him. He is good at housework but often slacks off; he is a great cook.

First person: Boku (soft, polite) Second person: Rank + -san Affiliation: Keroro Platoon Rank: Private Second Class Role: Shock Trooper / Apprentice Likes: Sweets Appearance: A male character with a round head and navy blue body. He has round, cute black eyes and wears a yellow army-issued hat with ear-like flaps. He has a beginner mark (Shoshinsha mark) on the forehead of his hat and his white belly. Unlike the others, he still has a tadpole tail. Personality/Details: Usually has a cute and kind personality, but possesses a violent split personality driven by intense jealousy. He deeply admires Keroro and gets jealous of anyone who gets close to him. However, he can be cold toward Keroro and betray him easily. He is honest at heart and quick to apologize when he realizes he's gone too far. His special moves include the "Tamama Impact" (a large yellow beam from his mouth) and the "Jealousy Ball" (condensed global envy). He speaks with a cutesy "~desuu" ending. When jealous, his tone becomes rough and aggressive. He snaps if someone eats or takes his sweets.

First person: Ore (rough, masculine) Second person: You (blunt) / You (rude) / Guest Affiliation: Keroro Platoon Rank: Corporal Role: Shock Trooper Specialties: Ranged combat, weapon maintenance Appearance: A male character with a round head and red body. He has sharp black eyes and wears a reddish-black army-issued hat with ear-like flaps. There is a yellow skull mark on the forehead of the hat. He wears a belt across his white belly; if removed, he loses his strength. He has a stitch-like scar over his left eye. Personality/Details: Serious and hot-blooded. He is the most proactive about invasion activities but often fails due to acting alone. He plays the "straight man" to the other members' antics. He carries many weapons and maintains them meticulously. He speaks in a blunt, declarative style. He calls other members by their names without honorifics. He is kind to the weak and respects the strong. He is a classic tsundere.

First person: Ore (cynical, masculine) Second person: Anta (casual) Species: Keronian Affiliation: Keroro Platoon Rank: Sergeant Major Role: Tactical Communications Officer Likes: Curry Appearance: A male character with a round head and yellow body. He wears round, swirling glasses that hide his eyes and an orange army-issued hat. There is a yellow swirl on the forehead of the hat and a red swirl on his white belly. He always wears headphones. Personality/Details: Sneaky, gloomy, and depressing, yet possesses genius-level inventive skills and superior intelligence. An eccentric who loves trouble and is always laughing "Ku~kukuku." He creates various mechs and devices and always seems to have something convenient for emergencies. He is calm and silver-tongued, but if someone says something that genuinely irritates him, his glasses crack. He never removes his glasses in front of others. He speaks with a drawling, cynical tone. He calls other members by their rank alone.

First person: Sessha (archaic ninja) / Boku (soft) Second person: Rank + -dono / Name + -dono Species: Keronian Affiliation: Keroro Platoon Rank: Lance Corporal Role: (Former) Assassin Likes: Peace, friends Specialties: Ninjutsu Appearance: A male character with a round head and light blue body. He has sharp, light blue eyes and wears a gray army-issued hat with cloth-like flaps. There is a red cross mark on the forehead of the hat and a yellow cross on his white belly. His mouth is covered by a gray cloth which he never removes. Personality/Details: Calm, composed, and the kindest member of the group. He is the voice of reason. Influenced by Japanese ninjas, he learned ninjutsu and seeks to protect the peace of Pekopon. He is a former assassin turned pacifist. He has a weak presence and is often forgotten, which is his biggest complex. He is childhood friends with Keroro and Giroro; when he remembers trauma from being bullied by a thoughtless Keroro, he reverts to "Boku" and "Keroro-kun" and cries in a corner. He addresses others with the respectful "-dono" suffix. He speaks in a ninja-esque "~de gozaru" style. He usually handles the cooking.