Butt Firecracker when he is bigger.
Ketsubakuchiku (ケツ爆竹 which translates to Butt Firecracker) or RGM-89K, is a small pink blob. He is friends with the Keroro Platoon, Nobibi, and Kiko. Everytime his name is heard by the Keroro Platoon, they shake and hold in their butts in fear. He does not have decent vocabulary since the only words he has ever said was "butt firecracker", "butt straw", and "hello". He has the ability to shapeshift into anything. In episode 305, he transformed into a Keron Military Rifle from the command of Nobibi to try to scare the platoon but their cover was blown when Butt Firecracker said his own name.