Mū

is the of Iwagakure.

Appearance
His body appears to be covered in bandages with only his eyes and nose visible. He also wears a dark colored headband with no markings.

Abilities
Muu has been seen to have some sort of ability that allows him to become completely invisible. It is hinted in his introduction that it's no easy task to catch him moving or being able to sense him.

Shinobi World War Arc
Mū, as a former Kage, was resurrected alongside various other notable shinobi by Kabuto Yakushi, in preparation for the Fourth Great Shinobi War.

After the development of these circumstances and the beginning of the conflict, he proceeded to head towards the Fourth Division's present destination. However, upon approaching his adversaries' location concealed from view, he was detected after inadvertently activating contact-sensitive sensor sand, something which he commended his opponents for achieving.

Trivia

 * can mean nothingness or non-existence; possibly alluding to his ability to become invisible.