Dororo (ドロロ), formerly known as Zeroro (ゼロロ), is a main character in the anime and manga series Keroro Gunso. He is of the rank Lance Corporal (兵長 Heichō) and he is a part of the Keroro Platoon. He is a kindhearted pacifist but also a fierce fighter. He used to be one of the best assassins in the Keron Army, but upon arrival on Earth he chose a life of serenity as a ninja, and swore to protect the planet.