Ryomen Sukuna

His previous appearance is described as a demon with four arms and two faces. He currently appears similar to the host he is in, but with spiky hair and unique markings on his forehead, nose, cheeks, and torso. He also has a second pair of eyes beneath his normal eyes, which are usually closed. Sukuna also has two lines on both wrists, arms, circles on both shoulders with a dot on each, two segmented curved lines on his chest, and two lines on his stomach while possessing Yuji.

Sukuna wears a light-colored kimono with a black border, a black scarf, and black shoes.

Sukuna is selfish, cold-hearted, immoral, and exceptionally sadistic. When he reincarnated shortly after Yuji ingested his finger, he commented, suggesting the massacre of women and children and comparing them to crawling worms. Due to his immense power, he rarely worries about the consequences of his actions, even if they affect his host, Yuji Itadori. In fact, he frequently teases and insults Yuji, calling him a brat and even laughing or amused by Yuji's despair on several occasions.

Sukuna is aware of his immense power and is quite arrogant about it, brutalizing a wielder of the finger while being patronizing and proclaiming his superiority over him. For this reason, he dismisses his opponents and rarely takes them seriously, even explicitly stating that he would kill Satoru Gojo to his face. However, these brutal traits should not be confused with stupidity. Sukuna is highly intelligent and manipulative, taking Yuji's body hostage, ripping out his heart to force him into a Binding Vow. He has also demonstrated an ability to recognize and praise his opponents, as shown in how, before killing Jogo, Sukuna acknowledged his strength despite having completely defeated him and told Jogo that he should be proud.