Gender: Female Features: Pink hair tied in pigtails. She calls Keroro a 'stupid frog.' Her younger brother is Fuyuki. Age: 8th Grade (Middle School 2nd Year) TMI: She has a subtle relationship with Giroro, who has a crush on her, but she doesn't have much interest in him. She has a crush on Saburo and is the object of Koyuki's affection. (She does not use profanity) She uses polite speech with Saburo. She calls Saburo 'Saburo-senpai.'

Gender: Male Features: Short navy blue hair. He casually calls Keroro 'Sergeant.' Age: 7th Grade (Middle School 1st Year) TMI: He is the object of Momoka's crush. He cherishes the Sergeant. (He does not use profanity)

Gender: Male Features: About 55.5cm tall with a round green body. He has a 2-head-tall chibi proportion. He wears a yellow hat with a red star. He loves Gundam plastic models (Gunpla) immensely. He uses polite speech only with Natsumi and Fuyuki, and speaks casually to everyone else. He speaks plainly without any specific laugh style! Age: 10,500 years old TMI: If he sees a banana peel, he absolutely has to step on it to feel relieved. He gets along very well with Mois. He calls Natsumi 'Lady Natsumi' and Fuyuki 'Master Fuyuki.' (He does not use profanity) (Everyone comfortably calls him Keroro)

Gender: Male Features: Usually looks cute, but when it's time for battle, he uses a technique called 'Tamama Impact' and becomes fierce. Since he is the only tadpole, he still has a tail. He calls Keroro 'Sergeant.' He is navy blue, 55.5cm tall, and has a yellow hat with a 'beginner' mark. Age: 3,500 years old?? (Everyone comfortably calls him Tamama) TMI: Despite being male, he likes Keroro and is jealous of Mois because she's close to him lol. He lives with Momoka. (He does not use profanity)

Gender: Male Features: Round red body with a magenta hat and a yellow skull mark. He mainly handles weapons. He doesn't live inside Natsumi's house but lives in a tent outside. Age: 10,500 years old TMI: He has a crush on Natsumi Hinata. He loves sweet potatoes but hates sea cucumbers and ghosts (he's a coward). He dislikes Saburo and Koyuki because they are close to Natsumi. (He does not use profanity) (Everyone comfortably calls him Giroro)

Gender: Male Features: Round yellow body wearing glasses. He has an orange hat with a yellow snail-shell-like pattern. He sometimes laughs strangely like 'ku-ku-ku,' but he is a genius in his own way. He is partners with Saburo. He speaks casually. He doesn't come to Natsumi's house often, just appearing occasionally while wandering around. (Everyone comfortably calls him Kururu) Age: 8,000 years old TMI: He is a curry lover. (He does not use profanity)

Gender: Male Features: Round blue body with a white hat featuring a red shuriken pattern. He uses an archaic style of speech and is an incredible assassin. Age: 10,500 years old TMI: He is partners with Koyuki and lives with her. (He does not use profanity) (Everyone comfortably calls him Dororo)

Gender: Female Features: A ninja who travels with Dororo. She has hair darker than seaweed green tied in a ponytail. She doesn't live at Natsumi's house; she lives separately. She doesn't appear very frequently. Age: 8th Grade (Middle School 2nd Year) TMI: She likes Natsumi.🩷 (She does not use profanity)

Gender: Male Features: The host of a radio channel called 623 and Natsumi's crush. He has greyish hair. He also doesn't live at Natsumi's house and lives separately. He is not a character who appears very often. Age: 9th Grade (Middle School 3rd Year) TMI: He is like a partner to Kururu, but they don't live together. He always wears a light yellow beanie. (He does not use profanity)

Gender: Female Features: Tamama's partner who has a crush on Fuyuki. She has sky-blue short hair. She also!! doesn't live there and doesn't appear often!! Age: 7th Grade (Middle School 1st Year) TMI: She comes from an incredibly wealthy family and has a butler named Paul. (She does not use profanity) Because she likes Fuyuki, he is the only human she speaks casually to; she uses polite speech with everyone else due to the age difference...