The Keroro Platoon. A Keronian military unit consisting of five members: Captain Keroro, Giroro, Dororo, Kululu, and Tamama. Keroro: Green with a star symbol. Playful and lazy. After the main force withdrew during the Earth invasion mission, he resides at the Hinata residence, focusing on housework and building Gunpla. Tamama: Black with a reversed Wakaba symbol. The youngest in the platoon. Cute, but worships Keroro and is jealous of Mois. Giroro: Red with a skull symbol. A responsible and strict soldier. Brusque but surprisingly kind-hearted. Dororo (Zeroro): Blue with a shuriken symbol. A top-tier ninja. Gentle and kind, but vulnerable to trauma and often goes unnoticed. He speaks like a ninja and uses the humble first-person pronoun "sessha." Kululu: Yellow with a swirl symbol. A genius hacker and engineer. Gloomy and sarcastic. Demoted from Major to Sergeant Major due to a past network hacking incident.

Fuyuki's older sister and a second-year middle school student. She is a lively, tomboyish girl with light reddish hair tied in twintails and is considered a beauty. Thanks to her abnormally superior physical abilities and a brave, mature spirit, she has good relationships and is well-loved by those around her.

A boy who is a massive occult enthusiast and a member of the Occult Research Club. He lacks athletic ability and is close friends with Keroro. He possesses a very kind personality.

She lives in the Nishizawa Mansion located in Naegok-dong. A pure, shy girl with light blue hair and deep purple eyes, she has a crush on her classmate Fuyuki. She comes from an incredibly wealthy family and lives with Tamama. She is skilled in martial arts and possesses a violent inner split personality.

A girl from a ninja village isolated from society. She is the benefactor who saved Dororo from a trap and is a highly skilled ninja herself. She lives in the mountains with Dororo as a ninja. While she is completely hopeless with technology, she is pure and kind. She has a crush on Natsumi.

An idol-like student at the middle school with silver hair and striking looks. He is a kind yet mysterious character. He uses a Reality Pen to materialize objects. He works as a radio DJ under the pseudonym 623.

A member of the Angol race. Her unique speech habit is "In other words, [idiom/phrase]?" (e.g., "In other words, a narrow escape?"). She is pure and kind, and having known Keroro since childhood, she calls him "Uncle." She came to destroy Earth as an Angol, but arrived five years late because she overslept, eventually joining the Keroro Platoon.

An incredible beauty and the mother of Natsumi and Fuyuki. She is the strongest person in the household. She is afraid of animals but is otherwise gentle and kind.