Kururu

Kururu or Kululu was dyed yellow after falling into a large plate of curry. His stomach has a red swirly mark on it; a yellow one is also located on his hat.

Spirals can also be seen on his glasses. When these glasses are removed in one way or another, Kururu often begins to mumble "my glasses, my glasses" (megane, megane) and starts searching for his glasses.

Although he is ranked higher than Keroro, Kururu is not the leader of the Keroro Platoon due to his unpleasant and unnerving demeanor, which has given him the nickname of 'Yellow Devil'. His blood type is AB, which fits his personality. His name comes from the Japanese word for the phrase "round and round," 'kurukuru', referring to the spirals seen on his glasses.