The world of sumo has many behind-the-scenes characters that help keep the sport running smoothly.
Some like gyoji (referees) and yobidashi (ring announcers) also have an on-dohyo presence that grants them a measure of visibility while others such as tokoyama (hair dressers) toil away out of the public eye.
Two more sets of men fall into the latter category. They are the wakaimonogashira and sewanin.