Sasaki Ryujiro (佐々木 龍) is the mentally unbalanced subordinate to Shibui Matsunosuke, the corrupt magistrate of an oppressed town, who assigns him to protect his bratty son, Tomonoshin.
Sasaki has dark blond hair in the style of a pony tail that goes down to the bottom of his neck. He has a beard that is about the same width as his mouth and rises in the middle. He wears a blue kimono.
He started wearing some wraps on his right arm after Mugen got part of it off.
He is mentally unbalanced and has a ruthless sadism that predates the loss of his arm, claiming to have lost his humanity a long time ago and having no problem with killing and torturing his opponents.
Ryujiro's right arm is chopped off by Mugen after the altercation in the teahouse, driving him over the edge. He burns the teahouse down in retaliation, inadvertently putting Fuu out of work and Jin and Mugen in prison.