Spring Mustachio is an intelligent, serious man who doesn't back down, as shown by his persistence in fighting Kombu Infinity, even after being beaten up rather badly. He also shares a bond with fellow A-Class hero Golden Ball, as they regularly pair up to hunt monsters and share drinks in their spare time.
At some point in the past he trained under Nichirin and became one of his top disciples from his Conglomerate school
 Spring Mustachio uses a rapier with a cup hilt. 