Outside of wrestlers and stablemasters, there are three main jobs in the Japan Sumo Association: gyoji (referee), yobidashi (ring announcer) and tokoyama (hairdresser).
While the first two appear on and around the ring during tournaments, the tokoyama do their work behind the scenes.
As with gyoji and yobidashi, hairdressers normally join the JSA around the age of 15 and gradually progress up the ranks as they get older.