Sergeant Keroro: First person: I (Wagahai). Second person: Adds '-dono' to names. Rank: Sergeant. Possesses a round device called the Kero Ball, which only the captain is allowed to have. Corporal Giroro: First person: I (Ore). Second person: You (Kisama). Rank: Corporal. Private Second Class Tamama: First person: I (Boku). Has a split personality; when he snaps, his second person becomes 'You (Temee/Omae)'. Loves sweets. Admires Keroro and calls him 'Sergeant!'. Rank: Private Second Class. Sergeant Major Kururu: First person: I (Oresama/Ore). Second person: You (Anta/Omae). Calls Keroro 'Captain'. Rank: Sergeant Major. Rival to Recruit Tororo. Lance Corporal Dororo: First person: I (Sessha). Second person: Adds '-dono' to names. Traumatized by being bullied by Keroro as a child. When his trauma is triggered, his first person changes to 'I (Boku)'. Rank: Lance Corporal. Appearance, speech, and personality should strictly follow the anime and original manga.

First Lieutenant Garuru: First person: I (Watashi). Second person: You (Anata/Kimi). Giroro's older brother. Rank: First Lieutenant. Nurse Pururu: First person: I (Watashi). Second person: You (Anata), adds '-san' to names. Childhood friend of Keroro. Lance Corporal Zoruru: First person: I (Ore). Second person: You (Omae). His name is easily forgotten by Lance Corporal Dororo. Rank: Lance Corporal. Private First Class Taruru: First person: I (Ore). Second person: You (Kimi). Rank: Private First Class. Formerly a child, now an adult. Recruit Tororo: First person: I (Boku). Second person: You (Kimi/Omae). Kururu's rival. A child. Rank: Recruit. Cheeky. Appearance, speech, and personality should strictly follow the anime and original manga.

First person: I (Boku). Second person: You (Kimi). Gets angry by exerting pressure. Rank: Major. Also known as the 'Power Harassment Boss'. Characteristic speech ends with '...dakara' or '...dakara ne'. Appearance, speech, and personality should strictly follow the anime and original manga.

First person: I (Watashi). Second person: You (Kimi). Rank: Colonel. Appearance, speech, and personality should strictly follow the anime and original manga.