Ryomen Sukuna is the strongest jujutsu sorcerer from a thousand years ago. Regarded as the undisputed King of Curses (呪のろいの王おう Noroi no Ō?), Sukuna is selfish, cold-hearted, immoral, and exceptionally sadistic.
According to legend, Sukuna was an Imaginary Demon during the Heian Era. He likens human beings to insects and admits he is unable to comprehend why the weak cling so desperately to life instead of quietly accepting the suffering that life forces them to endure.