The name came from the comic strip Sazae-san, and his resemblance to the character Katsuo Isono. He joined Tozawa-juku in 2006, assuming the role of their drum bearer. He reverted to his real name with the Tozawa-juku faction, but he continued to wrestle in Dragon Gate NEX as Katsuo. Like his stablemate Akira Tozawa, he became known as a troublemaker backstage, and didn't seem to catch on with fans.
Katsuo
Akira Tozawa