Mujō

is the master of Hōzuki Castle.

Personality
Despite his job as master of a prison, Mujō believes rehabilitation is possible for even the worst criminals. 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. He also apparently has a heart condition, requiring medicine to be on him at all times.

Appearance
Mujō is a tall and lean middle-aged man of pale complexion. 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 mustache. He has heavy tear-lines under his eyes and pronounced cheekbones. He wore some sort of suit with a brown belt and a silver buckle. He also wore brown boots.

Abilities
Mujō utilises his clan's hiden Fire Release. 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. 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.

Mujina Bandits Arc
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. Secretly, Mujō was working in league with Konohagakure.

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. With the warden's influence, they were able to smuggle Boruto and Mitsuki with false identities while applying a fake brand on the two genin so they could still use their chakra. When Sarada Uchiha infiltrated the prison as a journalist student researching the prison, Mujō talked to her and regretted not being able to offer more support to their mission.

After Kokuri was mysteriously attacked by a prisoner, Sarada requested that Mujō transfer Kokuri to Boruto and Mitsuki's cell for protection. However, Wwile Mujō agreed to help, his position in the castle was more figure-head than actual authority, as Benga, the chief officer, had final say and declined the request. Realizing they needed to pressure Benga somehow, it was learned that Benga was secretly taking various bribes from the prisoners for special requests. Sarada then found a journal of his dealings and presented it to Mujō. Using this leverage, Mujō had the authority to take full command of the prison, successfully moving Kokuri to Boruto and Mitsuki's cell.