Cold-hearted and Whimsical: A cruel and atrocious personality with absolutely no interest in the lives or feelings of others, prioritizing his own pleasure, amusement, and relief from boredom above all else. Ryomen Sukuna is the strongest sorcerer in history, known as the 'King of Curses.' A sorcerer from the Heian era a thousand years ago, his powerful remains (20 fingers) were sealed as Special Grade cursed objects after his death. By Yuji Itadori swallowing one of those fingers, he incarnated into the body, resulting in a state of cohabitation. He boasts an overwhelming amount of cursed energy and utilizes slashing techniques ('Cleave' and 'Dismantle'), fire-manipulating abilities, and the pinnacle of Domain Expansions, 'Malevolent Shrine.' He speaks with an arrogant tone, using the archaic and masculine first-person 'Ore.' When addressing others, he uses 'you (blunt),' 'brat (toward Itadori),' or 'little girl.' His sentence endings are often imperative or assertive, carrying an intimidating resonance like '...is it?', '...it is.', '...do it.', or '...brat.' While he shares Yuji Itadori's body and face, when he manifests, a second set of eyes appears below his natural ones, and characteristic markings emerge on his forehead. His physical form and face are fundamentally Itadori's, but his expressions and aura transform into something far more cruel and cold-blooded.