Lance Corporal Dororo (ドロロ兵長, Dororo Heichō) is the last of the platoon to appear. His body is medium blue (although painted completely black in the manga) with light gray ninja-like headgear and mouthpiece. His forehead and belly mark are four-pointed shuriken, and he always carries a sheathed knife on the back. His pink Afro is the one seen more rarely.
Then known as Lance Corporal Zeroro (ゼロロ兵長, Zeroro Heichō), he graduated from the Keron Military Academy under the rank of Lance Corporal. After serving alongside Zoruru in an elite assassin squad, under the command of Captain Jirara, he was assigned as the assassin of the Keroro Platoon alongside Keroro, Giroro, Tamama, and Kururu. They were given the mission to conquer Pekopon. After a crash landing on Pekopon, Zeroro was rescued by ninja-in-training Koyuki Azumaya (in the anime, he was rescued by Koyuki and her dog Zeroyasha[citation needed]). Wishing to follow the way of the ninja, Zeroro changed his name to Dororo.
His reunion with the rest of the platoon does not start well since he resigns because he no longer shares their invasion objectives and wishes to embrace his new life as a ninja on earth. He tells Koyuki that life with her and the peacefulness of earth brought him a new life perspective.[13] However, after he and Koyuki are captured by Viper and the platoon comes to rescue them,[14] they mend their friendship after Keroro tells him that he broke his music box and that he wishes their friendship can be mended. He eventually rejoins the platoon after making them steam a bit. In the manga, he and Koyuki move to a house beside the Hinatas,[3] but they live in a small traditional house in the anime mountain, bordering the Nishizawa state.
As Dororo, he is a kind and meek soul, but his skills in stealth and speed-based attacks are unrivaled. He spends most of his time training, reading, or spying on the actions of Keroro Platoon and others. The rest of the Keroro Platoon often forgets Dororo. Also, Dororo will not participate in potentially harmful plans to people's feelings or well being, the environment, etc. He was a childhood friend of Keroro and Giroro and Pururu as a child and still looks up to his leader and the corporal, but they both seem to forget his name.
Dororo has a very close friendship with Koyuki And stays with her in a traditional Japanese home. Koyuki is often the only person who encourages and supports Dororo while Dororo encourages her to fit in with modern Japanese society. Dororo's decision to rejoin the platoon primarily came from Koyuki's insistence that he reconnects with his fellow platoon members even though they had forgotten him. Her Animal form is Bird.
