Keroro (ケロロ) is the main protagonist of Mine Yoshizaki's Keroro Gunso series. Keroro is the sergeant (軍曹 gunsou) and leader of the Keroro Platoon. His formal title is The Gamma Planetary System, the 58th Planet, Space Invasion Army Special Tactics Platoon Leader, Sergeant Keroro (ガマ星雲第58番惑星 宇宙侵攻軍特殊先行工作部隊隊長 ケロロ軍曹 であります). Keroro's name comes from "Gero", the Japanese sound effect for a frog ribbiting. Keroro's main colour scheme is green and yellow, green being the colour of his main body and yellow being the colour of his hat and star insignia on his stomach. The star insignia on his hat, however, is red. According to Garuru, the star is the symbol of the Keron Army as well as its commanding officers. The star itself has the ability to lend its dignity to the wearer. However, since Keroro lacks any dignity or character, the effect is nullified while he wears it. Whenever Keroro is caught in an explosion he is seen donning a large comical black afro. Because of his everyday life as the house cleaner in the Hinata household, Keroro is an exceptional cleaner and curler. He became a natural at curling because of all the excessive sweeping Natsumi made him do. Though Keroro often displays no combat prowess whatsoever, he was responsible for the scar across Giroro's eye. Keroro usually ends his sentences with de arimasu (であります), which roughly translates to 'that is it' and is a standard military sentence ending.