Mizuki

- Mizuki as a chūnin. - Mizuki as a missing-nin. 1/2 Mizuki has white shoulder-length hair with a slight hint of blue to it and green eyes. He wore the standard attire of the Konoha-nin before his defection, which included flak jacket and forehead protector that he wore like a bandanna. Upon being sentenced to the Konoha Strict Correctional Facility in the anime, he wore the prisoner's uniform of a grey tunic with matching pants, with his prisoner number on the back, and going barefoot. During this time, he became much more muscular and well-defined in build to the point Naruto didn't recognise him at first. When Mizuki escaped from prison, he changed into an opened black vest, tight black pants, and a dark brown belt which had a silver rectangular belt buckle. When Mizuki drank the potion concocted from his cursed seal, he gained tiger-like stripes, which also gave him a more feral look. After the potion's effect wore off and his cells began a self-destruction, Mizuki shrivelled up into a frail and decrepit old man, his skin darkened brown and his skin heavily wrinkled. However, Tsunade managed to stabilise his deterioration, and even restored his appearance to his original form, before his time in prison.

As revealed in the anime, Mizuki was originally a childhood friend to Iruka Umino and stood up for him until he was overwhelmed by sheer jealous rage when Iruka was getting better treatment by everyone else. Despite his new-found hatred towards Iruka, Mizuki pretended to be his friend in order to be noticed and to discreetly keep Iruka miserable. In the anime, sometime after Mizuki became a chūnin, he was assigned, alongside two other men, on the Secret Document Recovery Mission (機密文書奪還任務, Kimitsu Bunsho Dakkan Ninmu). During their retreat, one of the comrades suffered a leg injury, and Mizuki suffocated the man to death, believing that the injury would cause him to be a hindrance to the mission's success, and then falsely reported that the comrade had died from the injury, which Mizuki exaggerated in severity. Orochimaru witnessed this transgression, and after praising Mizuki for being able to take such bold actions, gave him a prototype cursed seal. It was because of the controversy of Mizuki's actions and report during the mission that he was denied the position as an Academy instructor despite his performance in the test. Despite the lack of evidence leading to the investigation being dropped and eventually granting Mizuki the position, he nevertheless was infuriated when he overheard the committee's reason for initially not promoting him, leaving him to despise Konohagakure, especially when Iruka, who only performed well with Mizuki's assistance, made the cut. This feeling of being unappreciated for what he believes to be justifiable actions, along with meeting Orochimaru, made Mizuki decide that he would do whatever it took to rise to power and glory, even becoming a secret follower of Orochimaru. In the anime, Mizuki was the fiancée of Tsubaki, who saw him as a sweet man. However, after his involvement with Orochimaru, their relationship faltered. He expressed to her his hypocritical, prejudiced views on how Naruto Uzumaki is an evil individual, and revealed to her of his plan to steal the Scroll of Seals to present to Orochimaru, the latter information she withheld from the village, hoping Mizuki would come back to his senses.