He is one of the most seasoned Oni currently in service. It is not known exactly when he began his training, but it is said that Hibiki became an Oni training alone. He is seen as somewhat of a teacher by other Oni, even though Hibiki sees himself as just another fighter in the war against the Makamou. Due to his training, he is seldom seen worrying, he believes that with constant training he will always come out on top and does not need to worry about his safety.