Sukuna Reomin

Sukuna resembles the Itadori he currently inhabits, but with slicked-back hair, long, dark blue, pointed nails, and distinctive black tattoos on his forehead, nose, cheeks, and body. He has lines under his eyes and a pair of eyes above them,[1] which always appear slightly open in the anime. Sukuna also has two lines on his wrists and forearms, circles with dots on his shoulders, two nipples on his chest, and two lines on his stomach when he switches places with Yuji.
Sukuna is selfish, heartless, amoral, and an exceptional sadist. He is the embodiment of an overwhelming ego, a self-centered disaster. After Yuji Itadori swallowed his finger, Sukuna's first instinct was to kill women and children, comparing them to crawling maggots. Due to his immense power, he rarely cares about the consequences of his actions, even if they affect his vessel, Yuji Itadori. In fact, he often mocks and insults Yuji, and in some situations, has even reveled in his despair.