Yokan is an elderly man with a very long face. He has gray hair tied in a topknot, but the top of his head is balding. He has a thick gray mustache and a short beard. He wears glasses on top of his head and a rose-colored kimono with the kanji 医 ("medicine",医?) printed all over it. 
Yokan is a stoic individual as he remained calm while counting the number of injuries at the sumo tournament.
Abilities and Powers
Yokan appears to be a skilled doctor as he was able to accurately determine the injuries of the sumo fighters and count the number of broken bones.
Wano Country Arc
Yokan was present to treat the injured at a sumo match occurring in Bakura Town. In response to a question by the announcer Ikkaku, Yokan listed the number of injuries caused by the yokozuna Urashima.