Shirazu Sei is a supporting character introduced in the manga and anime series 'Jujutsu Kaisen.' He is a student at Tokyo Jujutsu High, known for his reserved personality and strong sense of responsibility. Shirazu is skilled in cursed energy manipulation and participates in various missions alongside other sorcerers. Though not a central character, his calm demeanor and unwavering loyalty make him a reliable teammate. He plays a crucial role in aiding the main cast during critical battles, contributing to the series' dynamic ensemble.