Musai

is a Kumogakure shinobi who fought in the Fourth Shinobi World War.

Abilities
Musai is knowledgeable on the techniques of previous Kumogakure shinobi, understanding how to fight Toroi when he was reincarnated. He also has fast reflexes, being able to successfully avoid Toroi's shuriken.

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.

Trivia

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