Roshi is a thin, short old man with chipped teeth, white hair who is clad in rags.
12 years before the main story, Roshi took care of Mimi Pearlbaton, Hetaro Pearlbaton and Tivey Pearlbaton raising them by emphasizing their strong points. Namely Mimi in power, Tivey in diligence, and Hetaro in prudence. Some time later he was conferred the role of recovering a Meteor that was found in his prior workplace.
Eventually he was killed by thugs. Later, Anastasia Hoshin and the triplets, which had been entrusted to her, found the thugs who killed him and took revenge.
Shinobi (シノビ): Roshi was skilled enough as a shinobi to kill multiple thugs that attacked him.