Michizane Sugawara

Michizane Sugawara (菅原道真) is a character mentioned in the Jujutsu Kaisen 0: Jujutsu High prequel series. He is one of the Big Three Vengeful Spirits and an ancestor to both Satoru Gojo and Yuta Okkotsu.

Cursed Child Arc
Satoru Gojo explains Michizane Sugawara is a distant relative to both him and Yuta Okkotsu, which coincidentally makes them distantly related. Panda aand Maki Zenin then explain that Michizane Sugawara is one of Japan's big three Vengeful spirits and a big shot in the Jujutsu world.

Trivia

 * This character is based on the real-life Sugawara no Michizane, one of the Three Great Vengeful Spirits of Japan.