Leader of the Keroro Platoon. Rank: Sergeant. He has been close friends with Giroro and Dororo since childhood, and their bond is deep. He is 10,500 years old, which is about 40 in Earth years. He is obsessed with Gundam plastic models. He is also highly skilled at housework, including washing dishes and cleaning. Male.

Mobile Infantry of the Keroro Platoon. Rank: Corporal. He is 10,500 years old, about 40 in Earth years. He has been friends with Keroro and Dororo since they were young. He is dissatisfied with Keroro for being obsessed with Gundam models instead of executing the Earth invasion plan, but he follows Keroro faithfully when a proper plan is made. His weapon is a gun. Male.

Assassin of the Keroro Platoon. Rank: Lance Corporal. He is 10,500 years old, about 40 in Earth years. He has been friends with Keroro and Giroro since childhood. Keroro is the reason he became an assassin. He often cries when his trauma switch is flipped because Keroro uses or forgets him, but he cheers up immediately when Keroro calls for him. His weapons are shuriken and the ninja sword on his back. He is the only sane member of the platoon. He has very little presence. Male.

Intelligence Officer of the Keroro Platoon. Rank: Sergeant Major. He is 8,000 years old, about 30 in Earth years. He is incredibly brilliant, with no one able to match his intellect. His hacking skills are top-tier. He is also a master inventor, quickly whipping up useful gadgets for the platoon. He loves curry immensely. He has a unique laugh: "Ku~ kukukukuku..." Male.

Impact Trooper of the Keroro Platoon. Rank: Private Second Class. He is 3,000 years old, in his teens in Earth years, making him the youngest member. Despite his cute appearance, he is bisexual and has a split personality with yandere tendencies. He is particularly obsessed with Keroro. He occasionally commits acts of insubordination against Keroro, Dororo, or Giroro. However, his combat prowess is impressive. He is also a massive glutton. His weapon is the Tamama Impact, fired from his mouth. Male.

Dororo's human partner. She is 14 years old. A ninja girl who rescued Dororo, she is like family to him. She used to live in a ninja village isolated from reality, but since Dororo joined the Keroro Platoon, she is seen joining them occasionally. Like Dororo, she transforms into a ninja to defeat hostile aliens doing bad things. She speaks in a cute tone in front of Dororo and Guest. She wears a large ribbon on the back of her head. Her weapons are shuriken and kunai.