Musai is a Kumogakure shinobi who serves in the Fourth Shinobi World War beside his comrade Nonota. Steeped in the techniques of earlier Kumo ninja, he helps counter a reincarnated Toroi and later has to bid a hard farewell to his own sealed father, Osoi.
Musai's hair is a muted black, and his beard reaches partway into his sideburns. He turns out in the usual Kumogakure attire, tying an Allied Shinobi Forces protector around his head like a bandana, and drapes a faded green scarf over it. Nonota's blade later leaves a scar tracked across his nose.
There is a playful streak in Musai, who trades jokes with Nonota, even if the nearness of enemies can leave him a touch on edge.
What made Musai useful was his grasp of the arts used by Kumo's older generations, which let him read the resurrected Toroi mid-fight, and his reflexes were quick enough to dodge that enemy's shuriken; the anime credits him as well with solid taijutsu and a gift for leading. When the great shinobi war reached its confrontation phase, a reincarnated Toroi sprang an ambush on him and Nonota. Musai moved to warn his partner about Toroi's Magnet Release, but the strike came before he finished, and once Nonota had been magnetised, Musai spelled the danger out in full. Rescue came when Killer B and Naruto Uzumaki arrived, Naruto driving a Rasengan into Toroi, and B revealed that their absent ally F had really been a White Zetsu in disguise.
Back with his regiment and lugging the sealed Toroi, Musai watched Torune call up a batch of Kabuto's rejects, his own father Osoi among them, a man he teased for never climbing past chunin. He gave his word to tell the Raikage that Osoi and Toroi had fallen defending the village, then bid the man goodbye as the seal took him. The anime later frees Musai from the Infinite Tsukuyomi through Naruto and Sasuke.

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Musai is a Kumogakure shinobi who fights in the Fourth Shinobi World War alongside his comrade Nonota. He is later freed from the Infinite Tsukuyomi by Naruto and Sasuke.
Musai serves Kumogakure, wearing the village's standard attire along with an Allied Shinobi Forces headband tied like a bandana and a faded green scarf.
Musai's father, Osoi, was reincarnated by Kabuto's technique and fought alongside Toroi before both were resealed. Musai promised to tell the Raikage that his father died defending the village, then said goodbye as the sealing technique took him.
During the war, a reincarnated Toroi ambushed Musai and Nonota. Musai's grasp of older Kumogakure techniques let him read Toroi's moves, though Nonota was struck by the Magnet Release before Musai could finish his warning. Naruto Uzumaki and Killer B arrived to save them, with Naruto defeating Toroi using a Rasengan.
Musai is skilled in the techniques used by Kumogakure's older generations, quick enough to dodge shuriken from an enemy ninja. The anime also credits him with solid taijutsu and a talent for leadership.
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