"Someday I will kill you! In this era or the next, I will kill you!"
Weapons: Claw on the left hand, Bandan Jiraihou
Fighting Style: Dosha no Bouheki
Allies: Enishi and the Six Comrades
Enemies: Kenshin and his friends
First appearance: Revenge Arc
Biography: Mumyoi doesn't like to be seen by anyone. In fact, it's the law of his family that whoever sees him must die. That's why he's after Kenshin. Kenshin saw him in the Binding Forest when he was trying to rescue Tomoe. Mumyoi vowed to kill him someday after Kenshin defeated him in battle. Because he was defeated by Kenshin, Mumyoi thinks the Yatsume family name has been dishonored and also seeks to kill Kenshin for this reason.
Personality Profile: Intense dislike of being seen. Arrogant due to his body's special abilities.