Iroha Mizuno  

, 水野 イロハ

Iroha is a 12-year-old boy who enjoys being quiet and modest. He has been friends with Cota Coga since childhood and was influenced by Mitsuya to like Bottle Battles. As a normal-ranked Bottle Battler, he will do his best. His name is derived from I Lohas, a Japanese brand of mineral water.