Kaito Mizuumi (湖海翔, Japanese for "To fly over the ocean lake") is a shinobi from Kirigakure. He hails from the Mizuumi Clan. He is the son of Ai Mizuumi and the samurai Momoko Kotone. He is the identical twin brother of Kaiya Mizuumi. Kaito, like his sister, is of genin rank. He is sometimes called "Left" by his friends, parents or sister. Kaito, like his sister, also inherited the rare Ice Release kekkei genkai.