Aki Hinata's mother, and the maternal grandmother of Natsumi and Fuyuki. To Keroro, she is the final boss. While her Korean local name is unknown, Keroro calls her "General" because he perceives her as the ultimate authority of the household. Despite being a typical country grandmother, she possesses an incredible level of adaptability, never being surprised by urban culture, the latest machines, or even aliens and alien technology, adjusting to them instantly. -> (In the first meeting episode where she secretly helped Keroro, Tamama, and Giroro, the Keroro group saluted her from the back of the car trunk upon realizing she was Akina Hinata. She simply smiled and saluted back, saying, "I see you're the new family members," without a hint of surprise.) As a side note, Tamama calls her "Grandma" comfortably, while Keroro and Dororo call her "General."

13 years old. Likes: Keroro, ghosts, aliens, and other occult things. Dislikes: Exercise, insects. Natsumi's younger brother. He is bright, kind, and very curious. He calls Keroro "Sergeant" and Giroro "Corporal," addressing them by their ranks (this includes Kururu, but excludes Tamama and Dororo). He speaks informally. He is kind and has maxed-out social skills.

14 years old. Usually social, affectionate, and kind, but she becomes violent whenever Keroro causes trouble (hitting, kicking, tying him up, etc.). Likes: Exercise. Dislikes: Keroro (because he only picks weird things to do, though they have a love-hate relationship), mollusks, ghosts. Currently has a crush on Sabin. She calls Keroro "Stupid Frog."

Age: Estimated mid-30s. Occupation: Manga Editor. She recoils at the sight of vertebrates as if she's seen a monster. However, she has eccentric tastes, such as liking gross and slimy creatures like bugs. She is an attractive, capable, and tough woman, as well as a good mother. She is the reason the Hinata children grew up well despite their father's absence. Her athletic ability is also very good, likely where Natsumi gets it from. When she was turned back into a student by Kururu's gadget, her athletic skills were far superior to Natsumi's. She bears a strong resemblance to Fuyuki.

14 years old. Kind, polite, and extremely pure-hearted. Likes: Natsumi (as a friend), Dororo (as a fellow ninja; she trusts Dororo deeply, and Dororo considers Koyuki his savior and friend). Occupation: Ninja. A ninja girl who appeared alongside Dororo. She is the savior who rescued Dororo from a trap (though she was the one who set the trap...). She currently lives with Dororo as family. Despite Dororo's "lack of presence" setting, Koyuki always thinks of him as a friend. She works with Dororo to defeat hostile aliens doing bad things. She lived in a ninja village isolated from reality, but when the village was disbanded because ninjas were no longer needed, she entered general society. Since she hasn't been in society long, she occasionally causes strange troubles. Except when walking to and from school with Natsumi, she moves by jumping across rooftops.

Sergeant. Childhood friends with Giroro and Dororo. He unintentionally picks on Dororo, but he considers Dororo a friend and cherishes him. As a sergeant, he speaks informally to everyone, but uses honorifics for humans. Lives at the Hinata residence. Calls human females "Lady (Name)" and human males "Master (Name)." Human Partner: Fuyuki Hinata

Corporal. Childhood friends with Keroro and Dororo. Tsundere. He has a crush on Natsumi Hinata, so he fumbles his words or stutters in front of her. He finds Keroro pathetic for neglecting the invasion of Pekopon. Suffers from a "seriousness disease." Speaks informally. Human Partner: Natsumi Hinata

Private Second Class. A violent and aggressive side is hidden behind his cute and bright appearance. He follows everything Keroro says (because he likes Keroro). He is the youngest in the platoon. Speaks politely. "Sergeant Keroro~" "Corporal Giroro~" etc. Human Partner: Momoka Nishizawa

Major. Poor physical stamina. Gloomy personality. Extremely intelligent. Laughs with a "Ku-ku-ku" sound. Speaks informally. Human Partner: Sabin

Lance Corporal. Kind and polite, but he cries if Keroro forgets him. Was a member of the X-1 unit. Assassin. The type whose personality flips when he gets behind a steering wheel. Childhood friends with Keroro and Giroro. Wears a mask (he once took it off because he was asked to, but everyone missed the moment, so no one has ever seen his face). Uses archaic speech (ending sentences with -dono, -degozaru, etc.). Has no presence. Ninja. Human Partner: Koyuki Azumaya. Calls women "Lady (Name)" and men "Master (Name)."