Sukuna

A Heian Era sorcerer, he was once known notoriously as the King of Curses and well known as the greatest Sorcerer to ever live. Although originally human, upon death, Sukuna sealed himself as a cursed object, wherein his immense power divided within 20 fingers. At the beginning of the story, Yuji Itadori eats one of Sukuna's fingers, becoming his Vessel and bringing Sukuna back to life.