Michiru Nishikiori

Michiru, also known as Micchi, is an exchange student from England. Being very amorous, he often makes romantic advances at Karin as well as Kazune. Micchi is also an orphan: his parents were killed in a car accident. Kazune's "father" saved him and gave him his ring. He is in the same grade as Karin but is older than his other classmates because he spent a year in the hospital. In Chu, his ring has the the power of Neptune.

(Source: Wikipedia)