Koko Ninna-Nanna




 * Voiced by: Yukari Tamura (Japanese), Jennifer Sekiguchi (English)
 * A very young and playful girl, a feisty girl with risqué humor packaged in a petite frame. She may be young for a Melos Warrior, but she is just as masterful and confident as the other Melos Warrior. Her last name is the Italian word for lullaby.

Koko is a very young and playful Melos Warrior who leads insurgents in what she calls an "armed theatrical group" fighting against monster-run society. Koko is smarter than Bocca and more mature as a warrior, with an adult's sense of humour that somewhat compensates for her tragic past. She might be categorized as a dorodere and masegaki. Her last name is the Italian word for lullaby, and her special attack is Four Card (a reference to four-of-a-kind, a very good hand in Poker.) A Monster Union Agent kidnapped her from her parents in the toy section of a department store. She managed to escape before she could be sacrificed; however, to this day she cannot remember who her parents were or where she lived. She is accompanied by three Unicorn-series aibar machines: Hikari, Nick, and Kuron. They came together when Koko awakened them. She had wanted to free all of the Unicorn-series Aibar Machines, but had no chance to so she set these three free and gave them names. Together they form the armed theatrical group Chentauro. Upon meeting Bocca and his friends, fighting monsters and uncovering mysteries together, she was reunited with her father, the Prime Minister. Misadventure has it that they only come together when he was at the brink of death. Father and Daughter never get to know each other beyond physical appearance. Her Melos tattoo is on her right cheek. Her command for her Melos arrow is "Four card." Her bow is formed from a stick that she carries, which expands to a bow at her command.