As a member of the Wolf Fang Pirates, Yumeji is a competent crew mate as well as a valuable asset for the crew. Being their official shipwright, Yumeji is in charge of maintaining the Howling Wolf's condition, along with the other vehicles, instruments, or weapons that the Wolf Fang's may employ. He is also an accomplished surgeon as he was able to perform an operation on himself twice, despite the fact that he doesn't specialize in the field. He was able to do this even though he was close to death.