She comes to Earth and assumes the identity of Ku-chan, Natsumi's old abandoned teddy bear. After she is discovered, she is taken into the Hinata Household, where she loves and treats Nuii like a regular doll. Under the instruction of her superior, Gyororo, Nuii starts turning the Keroro Platoon and Fuyuki into dolls. When Gyororo urges Nuii to turn Natsumi into a doll, the memories of the time she and Natsumi had spent together make her hesitate and turn on Gyororo. Nuii can hold Gyororo still long enough for Keroro to capture him in a bubble. Afterward, Nuii turns everyone back to normal and flies back to Planet Keron, searching for her former owner. Gyororo Voiced by: Hiromi Hirata (Japanese) spies on the Keroro Platoon and reports their findings to Shurara. Gyororo ordered Nuii, once their comrade, to turn the Keroro Platoon and Fuyuki into dolls. However, when ordered to attack Natsumi, Nuii disobeyed and restrained Gyororo long enough for Keroro to trap them inside a bubble. They became a prisoner of the Keroro Platoon. They are a purple-blue and green tadpole Keronian with multiple eyes covering their body, hat, and the tip of their prehensile tail. They have a crazed smile full of sharp teeth, and their irises are red. They can merge and blend in with their surroundings, though one of their eyes is always visible. They can shoot lasers from their eyes. Gyororo has never canonically been referred to by any male or female pronouns. Thus they have no gender until their creator confirms it. Robobo Voiced by: Keiichi Sonobe (Japanese) is programmed to steal the Keron star from Keroro. In episode 185, Robobo turned everyone into an electrical appliance to make them helpless. Dororo defeated him, but Robobo returned, so the platoon had to use the Grand Keron to defeat him. Robobo has square-shaped glass eyes. His symbol is a white circle with a smaller black circle inside it. He wears a skull cap with headphones. His hands and feet are magnets. His larger form has two drills instead of magnets for hands. He has the power to fuse an entire city population with a nearby mechanical object. He can fly using built-in jets. Yukiki Voiced by: Eiji Maruyama (Japanese) is an adult snowman Keronian, introduced as Yukiki of the Mount Daisetsu Wind. He has a carrot for a nose and wears red mittens and a