Once a lone robber, he is now a member of Five Leaves as a spy and gathers information about their targets. He creates metal hair ornaments for women as a business to generate money outside of the Five Leaves gang. Calm and collected, Matsukichi usually does his job, but once he has a goal, he doesn't stop until he achieves it, making others think he is reckless.
It is revealed that Matsukichi works for the Five Leaves because he is indebted to leader Yaichi, who in the early days saved him from a group of pursuers who caught him trying to steal money as a sneak thief. He also stole money in order to support his wife and son, who he never knew he had, when the son was injured.