Originally a mercenary who fought wild creatures on the outskirts of Goldensparc, Koirin's excellence in battle was picked up on by an Arcane monster-fighting organization. He was sent to the Starfall Isles to become the third and final team member of Cascade and Sakura's hunting squadron. Unlike his two Arcanite teammates, who knew each other as hatchlings, Koirin is a stranger to the group. He's had a difficult time adjusting to this dynamic, and finds himself withdrawing when not in battle- the only place where he can truly focus. Despite his cold and aloof demeanor, Koirin holds himself to an incredibly high moral standard in his actions, which he believes matters more than minor social niceties. He is fond of coffee and dislikes confined spaces.