Characters so strong that their presence/absence defines the story

1. Satoru Gojo - The undisputed strongest sorcerer of the modern era. So strong that villains in the show cannot act openly and go to great lengths to incapacitate him even momentarily. For example, <!Kenjaku creates a barrier that serves only to keep Gojo out during the Kyoto Sister School exchange, allowing Hanami to wreak havoc. This barrier only lasts a number of minutes before Gojo breaks it, nearly killing Hanami moments after breaking the barrier.!> Also, <!Kenjaku goes through great efforts to get Gojo to a mental state where he will be lost in memories for a matter of momentsWhen Gojo is sealed in Shibuya, everything immediately goes to hell: Kenjaku starts the culling games, the jujutsu higher ups execute Principal Yagami and reimpose Yuji’s death sentence, Sukuna destroys Shibuya almost entirely, and curses run rampant.!>