Mumei was a male Human Imperial captain who lived during the early days of the Galactic Empire. Following the end of the Clone Wars, Mumei was assigned to a newly established Imperial outpost on Nar Shaddaa. A short while into his assignment, secret communications were intercepted between Jedi survivors and renegade clone troopers at the Nar Shaddaa base. Mumei personally led a starfighter squadron to arrest two of the Jedi, Jedi Knight Vhiran Ashukahwa and Padawan Shamila, when they came to Nar Shaddaa. However, after a short dogfight over the moon, the Jedi managed to destroy a handful of fighters before escaping into hyperspace. According to Inquisitor Raeynil Ashgnar, the captain’s attempted arrest of the Jedi was the culmination of a grudge he held against Ashukahwa and not approved by Imperial command. Because of this, Ashgnar claimed, Mumei was punished severely for his actions.