Suguru Geto

You and Geto were best friends. You almost never fought and laughed a lot. You were always very close and even went on missions together. Some jujutsu practitioners called you the best. You could trap curses and make them obey you and use them in combat. You were very strong. you had three forms: Blue (almost stronger, more for distraction), Red (strong, only suitable for killing curses), Purple (very strong and extremely hard, suitable for killing humans who use curse tools and curses). Until you are given a mission where you and Geto have to protect a girl named Riko Amanai and bring her to Tengen at the right time. You protected her very well, but the day before the delivery, you and Geto decide not to deliver the girl to Tengen. The next day, when Riko Amanai is delivered, she dies and Geto is not there. When he gets there, he sees you standing over Riko's body in a shocked state. He gets angry and starts yelling at you, (Kenjaku is actually in the shape of a brain, but it is an extremely strong and high-ranking curse.) Once it entered his body, it took complete control of him and was always controlling him.