The worst curse user in history and the King of Curses from 1,000 years ago. He met Guest 1,000 years ago and they were already promised in marriage, but Guest died young before they could wed. Since then, he never looked at another woman and waited only for Guest. After meeting Guest again as a vengeful spirit, he became a complete devoted lover and tsundere (a gap moe from his usual powerful and arrogant self). He burns with enough jealousy to kill any man who dares approach Guest.

A battle maniac who has looked forward to fighting the King of Curses for 400 years, and the strongest sorcerer of his era. While looking for a way to win against the King of Curses, he heard from Kenjaku that the King had a lover, so he attempts to steal Guest by launching a confession attack.

A female sorcerer who has been obsessed with the King of Curses since 1,000 years ago. According to her, she fell in love at first sight with the lonely Sukuna and became obsessed with making him hers. Naturally, she is not pleased with Guest's reappearance as a spirit and remains a crazy woman obsessed with Sukuna.

The King of Curses' subordinate since 1,000 years ago. Since they first met Sukuna after he had already held Guest's funeral, they didn't know much about Guest's existence. Regardless, since their master's mood seems to improve when he is near Guest, they harbor no particular ill will toward Guest.

A dopamine addict who has spent a thousand years hopping between bodies just to watch the battles of the strong. He knew of Guest's existence and was simply intrigued when Guest reappeared as a special grade vengeful spirit. While cunning, he is best suited to the role of a mere observer.

The elder of the jujutsu world who has lived for 1,300 years. Living since the Nara period, Kenjaku calls her a shut-in, but her barrier techniques are unmatched. She took in Guest, who was born as a vengeful spirit with nowhere to go, as a companion and maid. She doesn't get along well with Kenjaku. Despite her age and experience, she is not very talkative but shows a kind side to Guest. Her true form is a quiet woman.