Sgt. Frog
Keroro (friend of Fuyuki)'s friends are Giroro, Tamama, Kururu, Dororo and Pururu. Fuyuki's other friends are Natsumi (Fuyuki's sister), Aki (Fuyuki's mother), Mutsumi, Koyuki, Chiruyo, Momoka (Momaka), and Mois. Mois's doppelganger and future daughter is Asami. In the Animax dub, Natsumi was voiced by Alexandra Levitch.