Musai

is a Kumogakure shinobi.

Appearance
Musai had shoulder-length dull-black hair which was mostly concealed by his forehead protector which bore the Allied Shinobi Forces' symbol. He also had a full beard and wore the standard attire of the Kumo-nin along with a green scarf tied around his neck.

Shinobi World War Arc
During the Fourth Shinobi World War, he and Nonota were ambushed by a reincarnated Toroi. Recognising his fellow Kumo shinobi, Musai tried to alert Nonota about Toroi's techniques, but they were attacked before he could finish. After Nonota was magnetised, he further explained Toroi's abilities. Both are saved by the arrival of Naruto Uzumaki and Killer B, Naruto slamming a Rasengan against Toroi.

Musai explained how they were headed to Headquarters when they were separated from F and the others, only to be shocked by B, who revealed that F was actually a transformed White Zetsu Army clone.

In the anime, after they left, Musai and Nonota were briefly suspicious of the other being a transformed White Zetsu as well, before realising the enemy tried to kill them both, meaning they were both on the same side. They laughed it off, and then Musai joked, pretending to be a transformed White Zetsu Army clones, only for Nonota to slash his nose with a kunai in defence.

Trivia

 * His name means . It is also a shortened form for "filthy, squalid, dirty".
 * Though a character in the manga, Musai was only named in the ending credits of the anime.