Toji Fushiguro

Megumi's father, born a Zen'in with no cursed energy at all: the complete heavenly restriction gives him a superhuman body and senses. A killer for hire, in 2006 he kills Riko and nearly kills Gojo.

Gojo, reborn through the reverse technique, kills him with Purple. In 2018 at Shibuya the curse user Ogami summons him into her grandson's body: the body takes over, kills her and Dagon, then faces Megumi without recognising him; when he understands who he is and that he no longer bears the Zen'in name, he kills himself.