Kazuki Yasaka

Age: 14
Birthday: 29 April
Blood type: B

A second year middle school student who is transformed into a kappa alongside Toi and Enta. He formerly played soccer with Enta, where they were known as the "golden duo", though he quit the sport immediately prior to the events of the series. He also cross dresses as the idol Sara Azuma to take selfies for his brother Haruka.

(Source: Wikipedia, Sarazanmai Wiki)