Having learned that one of Hōzuki Castle's prisoner was a deserter of the infamous and elusive Mujina Bandits, Kokuri, who was willing to give information on the gang in exchange for protection from them, Naruto Uzumaki reached out to his old acquaintance in Mujō for help. Secretly, Mujō was working in league with Konohagakure.

When Boruto Uzumaki and Mitsuki were sent to prison as wanted criminals, Mujō was first to greet all the new inmates, explaining the nature of their imprisonment and branded them all with his technique before leaving and letting Benga take over the explanation. Also, as the warden of the Hōzuki Castle, he had access to its summon: a two-headed, fire-breathing hound passed down from warden to warden, used to hunt down prisoners who attempt to escape. In addition this technique being the focus point of keeping prisoners on lockdown in Hōzuki Castle, he's skilled enough to fake an application of this technique in front of other prison employees without them suspecting anything. Combining it with Juinjutsu, he can brand people, blocking off their ability to mould chakra and even more, prevent the target from leaving a certain radius without bursting into flames. Mujō utilises his clan's hiden Fire Release. He wore some sort of suit with a brown belt and a silver buckle.

He has heavy tear-lines under his eyes and pronounced cheekbones. He has a full head of grey hair with bangs hanging over left eye and also sports a full but well-groomed beard with a mancho moustache. Mujō is a tall and lean middle-aged man of pale complexion. He appears to have a heart condition, requiring medicine to be on him at all times. He also does not tolerate any of his subordinates who abuse their authorities, as he swiftly fired Benga upon discovering his of soliciting bribes from inmates and extending sentences for his own reasons. He also a selfless man despite Kusagakure being uninterested in aiding other villages in matters that had no affect on them, Mujō offered Konohagakure some aid in coordinating a mission to protect the potential informant.

Despite his job as master of a prison, Mujō believes rehabilitation is possible for even the worst criminals.

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