Muku

is Mui's son that appears in Naruto 5: Blood Prison. Because of the influence of the resurrection technique, it's hard to tell if he is a real villain or not.

Appearance
Muku has long black hair tied on to a ponytail and has dark brown eyes.

Abilities
Though not much is known about Muku's abilities, he has shown to be proficient with Fire Release techniques, allowing him to make fire like appiritions to attack his enemies with Fire Release: Demon Lantern. He has been seen to be strong enough to pierce his father's chest bare-handed technique upon his resurrection.

Trivia

 * His name means "purity" or "innocence".