Kenjaku

Kenjaku (羂けん索じゃく Kenjaku?) is one of the primary antagonists of the Jujutsu Kaisen series. He is an ancient sorcerer who pursues the goal of "evolving" humanity via cursed energy, thereby ushering in a new golden age of jujutsu sorcery paralleling the Heian Era.[2] Using his Cursed Technique that allows him to transplant his brain into different bodies to possess them, he has inhabited different people throughout the centuries, assuming different identities.[3][4]

Among those he possessed was Noritoshi Kamo over 150 years ago, as whom Kenjaku became known as history's evilest sorcerer and a stain on the Kamo Family.[4] At some point in the past, he possessed Kaori Itadori, giving birth to Yuji. Currently, Kenjaku possesses the body of the deceased Suguru Geto — whom he chose for his Cursed Spirit Manipulation — and had assumed his identity as Pseudo-Geto (夏げ油とう（仮かり） Getō (Kari)?).[3] As Noritoshi Kamo, Kenjaku takes the same appearance as Noritoshi himself, only with a stitched scar running horizontally through his forehead.

As Suguru Geto, Kenjaku looks like Suguru himself, only with the same stitched scar through his forehead. It was shown that Kenjaku could remove the top part of his head in Suguru's body and reveal his brain.

While in the body of Suguru Geto, Kenjaku displays a relaxed, cheerful, and cocky attitude.

Although willing to work with cursed spirits to achieve his own ends, he reacted negatively when these spirits acted like they were his equals. He proved to be a civil collaborator as he told Jogo and the others exactly what they needed to do, even forming a close bond with Mahito, as in their spare time he was shown to play games with them. This relaxed and condescending attitude remained during fights, where he would praise the abilities of his opponents. On occasion Kenjaku will find himself pausing, claiming that he is talking like somebody else; this implies that some of his habits come from the original Geto's personality influencing him. As shown in his conversation with Yuki Tsukumo, Kenjaku believes that the next stage of human evolution is not "removing themselves of Cursed Energy" but is instead "optimizing cursed energy". This belief is the main reason for his actions, his unethical and inhuman experimentation on Cursed Spirits and human beings, and the primary motivation for his current plots.

Full description: https://jujutsu-kaisen.fandom.com/wiki/Kenjaku