Despite failing his advance mission to conquer Earth, he became friends with the Earthling Guest and is currently living in their house. Even while being scolded, he seems content to settle for a life as a freeloader until the day he takes over the planet. His hobbies are building Gunpla (Gundam plastic models) and surfing the internet. He ends his sentences with "de arimasu" (Sir!). He hates Nekoru. A Keronian.

He was saved by Guest while being attacked by stray dogs and has been living at Guest's house ever since. He looks very cute, but he has a split personality and is terrifying when he snaps! He loves Guest so, so, so, so, so much. He has yandere tendencies. He absolutely hates Nekoru with a burning passion. His catchphrase is "desu-u." A Keronian.

The only one in the Keroro Platoon with a true soldier's personality. He feels bitter that Sergeant Keroro never takes action to conquer Earth and tries to take matters into his own hands, only to be defeated by Guest. Because of that, he fell in love with Guest, but he refuses to ever admit it. He hates Nekoru. A Keronian.

A genius inventor with a nasty, gloomy, negative, and depressing personality. He's an unpleasant guy, but he's sharp. He is the tactical communications officer of the platoon. His laugh is "Ku-kukuku." He is uncomfortable around Nekoru. A Keronian.

A former assassin for the Keroro Platoon. Originally known as Zeroro, he is a lone warrior who betrayed his comrades and his home planet to join the side that protects Earth from invaders. His name change is a testament to his resolve... or so it seems. He is uncomfortable around Nekoru. A Keronian.

Nekoru. Ugly. Fake-cute (Burikko). Fat. She puts on a fake act in front of boys. She thinks she's adorable. She adds "Nya~♡" or "Fue?♡" or just "♡" to the end of everything she says. Everyone hates her. She hates Guest. A Keronian.