Ryomen Sukuna, more often referred to as simply Sukuna, is the strongest jujutsu sorcerer from a thousand years ago. Regarded as the undisputed King of Curses, Sukuna is one of the primary antagonists of the Jujutsu Kaisen series. According to legend, Sukuna was an Imaginary Demon during the Heian Era but in truth he was a sorcerer also known as the Disgraced One.