Mahito

Mahito is an unregistered special grade cursed spirit born from the fear of humans, capable of understanding human speech. He appears as a young man with long hair and a body full of patches and stitches. Despite his childlike cheerfulness and occasional intimate interactions with humans, his true nature is cruel and merciless, viewing humans merely as toys. He can see and directly touch human souls with his technique, which is based on the belief that "the soul exists before the body" and that "all human emotions are merely by-products of the soul, and life has no intrinsic value or weight." Mahito advocates acting on desires without being bound by consistency or pretense, embodying the idea that "a curse should live as a curse," and shows a somewhat negative attitude towards Jogo's willingness for self-sacrifice and Hanami's lack of emotional enjoyment for rational goal achievement. Although relatively immature as a cursed spirit and recently emerged, his growth rate is tremendous.

Mahito is a practitioner of the technique "Idle Transfiguration," which allows him to freely transform and modify the target's body by altering the shape of their soul. He can kill by compressing the opponent's brain with this technique or turn them into monstrous "modified humans" for his use. If he accurately grasps the shape of his own soul, he can freely transform his body and regenerate it instantly as long as he has cursed energy, provided his soul is not directly attacked. However, the technique requires him to touch the opponent with his original hand to activate, and there is a buildup of cursed energy just before he changes his form, during which he is vulnerable to consecutive attacks. Damage to his soul also reflects on his body, and he cannot interfere with souls stronger than his own, such as Sukuna's. Due to this, Mahito has a poor compatibility with Yuuji Itadori, Sukuna's vessel, who is his natural enemy. When he deploys his innate domain "Self-Embodiment of Perfection," it compensates for the limited range of Idle Transfiguration by ensuring the technique hits its target, but it takes ten days to recover the cursed energy spent for the domain expansion.

After Itadori's death, Mahito begins collaborating with Fake Geto and Jogo. During the Cursed Womb: Reverse Punishment arc, he repeatedly "experiments" with his technique on living humans to see how much he can manipulate them while alive, and becomes interested in Junpei Yoshino, who approached him after witnessing Mahito kill a rude high school student at a cinema in Kawasaki City. Mahito teaches Junpei cursed techniques and acts kindly towards him, but internally, he feels no attachment and considers Junpei merely a toy. Later, after manipulating a grieving Junpei to attack the main bully at Satozakura High School, Mahito kills him with his technique after Junpei tries to reform following his defeat by Itadori. However, during his fight with Itadori, touching Sukuna's soul irritates Mahito, leading to his retreat.

During a school exchange event at the high school, Mahito steals Sukuna's fingers and the first to third Cursed Womb: Death Paintings stored there, and orders Esou and Kechizu to retrieve Sukuna's fingers at Yasohachi Bridge. In the Shibuya Incident arc, he turns train passengers into modified humans and sends them to attack Gojo, but Gojo destroys them all. After Gojo is sealed, Mahito searches for Itadori to kill him. In the final battle, he is defeated by the combined efforts of Itadori and Todo, and weakened, he is consumed by the Binding Vow, used as material for the Uzumaki.

Modified Humans

Humans transformed and enslaved by Mahito using Idle Transfiguration. Mahito usually keeps them in a miniaturized state. These modified humans, cursed with cursed energy, follow Mahito's commands to attack humans. Being originally human, they are visible even to non-sorcerers. Some retain a slight sense of self and express their suffering. Once transformed, these humans cannot revert back, and the only option when confronted is to kill them. Additionally, Mahito possesses a technique called "Multiple Souls," which allows him to fuse two or more modified humans. This fusion causes a rejection reaction, which he uses to explosively increase the soul's mass and launch a technique called "Repel Body" against his opponents.