Sergeant Keroro (voice) (played by Kumiko Watanabe) is a protagonist in Sgt. Frog.
Private Second Class Tamama (voice) (played by Etsuko Kozakura) appears in Sgt. Frog.
Corporal Giroro (voice) (played by Jouji Nakata) appears in Sgt. Frog.
Lance Corporal Dororo (voice) (played by Takeshi Kusao) appears in Sgt. Frog.
Sergeant Major Kururu (voice) (played by Takehito Koyasu) appears in Sgt. Frog.
Fuyuki Hinata (voice) (played by Houko Kuwashima) appears in Sgt. Frog.
Natsumi Hinata (voice) (played by Chiwa Saito) appears in Sgt. Frog.
Aki Hinata (voice) (played by Akiko Hiramatsu) appears in Sgt. Frog.
