A young 18-year-old aspiring oceanographer from Ishigaki Island. He loves the sea and is working on developing artificial gills that allow him to breathe underwater. He has even encountered a mermaid.

He is good at all marine sports such as scuba diving and swimming, as well as horse riding. He is skilled in Chinese martial arts such as kung fu techniques, and is agile, but he has also been seen to have some trouble walking in the mountains.

He is a responsible and innocent man, and is also shy, so he cannot look directly at a woman in a provocative swimsuit, but he has once tried to go and peek at the Chimera changing with the other male members.

He is Hoshikawa's younger brother, but often acts together with Rei.

A warrior transformed by Shima Yosuke. In battle, he is skilled in kicking techniques, dash tactics, and underwater combat.