Ryomen Sikuna is a Heian Era sorcerer, hes the King of Curses over a thousand years ago, the undisputed most powerful Curse of all time. Believed to always have been a Cursed Spirit, is not a cursed spirit yet he was in fact a human sorcerer before sealing himself as a cursed object Sukuna is described as a demon curse, with four arms and two faces. Previously, hair slightly pushed upfront and with curse markings on his forehead, nose, cheeks, upper body, and abdomen, and mouth on his stomach