Kululu, also known as Sergeant Kululu, is a central character in the anime series Keroro Gunsou. He is a yellow Keronian and serves as the intelligence officer and scientist of the Keroro Platoon. Known for his mischievous personality and distinctive cackle, Kululu often invents gadgets and schemes that can be both helpful and troublesome for the platoon. Despite his eccentricities, he plays a crucial role in the group's mission to conquer Earth, often providing technological support and strategic insights that are essential to their plans.