The Mt. Atama Thieves are a band of roughly 280 bandits operating in Wano Country, willing to rob the rich Beasts Pirates and the poor alike. Their last leader was Ashura Doji, known as Shutenmaru, who eventually allied them with the Kouzuki cause.
Based in Wano Country, the Mt. Atama Thieves are a gang of bandits who steal without discrimination, hitting the Beasts Pirates and Wano's struggling citizens in equal measure. Franky pegged their numbers at around 280. Their last known chief was Ashura Doji, who went by the alias Shutenmaru, and their emblem mimics his distinctive hairstyle, first shown paired with a shimenawa rope.
The group survives by plunder across the impoverished land. Weeks before Luffy reached Wano, Shutenmaru and his thieves raided the food stores of shogun Orochi's Paradise Farm in Kuri. They later appeared robbing the people of Okobore Town until Jack confronted them, and Shutenmaru traded blows with Jack until Kaidou's arrival forced the bandits to fall back. A clash with Inuarashi at Mt. Atama followed before Kin'emon broke it up.
Shutenmaru anchors the band. After Holed'em's subordinate torched Mt. Atama, he marched on Bakura Town for revenge and witnessed Yasuie's execution beside Kin'emon and Inuarashi. Furious to learn Kin'emon had framed him for theft, he was eventually won over by an apology and a plea for aid. Shutenmaru then led his gang to the graves of those who had died fighting Kaidou a decade earlier and signed on to the Kouzuki Family's alliance, bringing his thieves with him.

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Yes, Shutenmaru, the leader of the Mt. Atama Thieves, became an ally after being won over by Kin'emon's apology. He signed his gang onto the Kouzuki Family's alliance against Kaidou.
The Mt. Atama Thieves are a band of roughly 280 bandits operating in Wano Country who steal from both the Beasts Pirates and Wano's struggling citizens without discrimination.
The Mt. Atama Thieves were led by Ashura Doji, better known by his alias Shutenmaru. The group's emblem mimics his distinctive hairstyle.
Weeks before Luffy reached Wano, Shutenmaru and his thieves raided the food stores of shogun Orochi's Paradise Farm in Kuri. They were later seen robbing the people of Okobore Town until Jack confronted them.
Shutenmaru was furious to learn that Kin'emon had framed him for theft. After Kin'emon apologized and pleaded for his help, Shutenmaru led his thieves to the graves of those who had died fighting Kaidou and joined the Kouzuki Family's cause.
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