Ryomen Sukuna

Sukuna is an extremely intelligent individual. He has fully grasped the nature of cursed techniques, curses and reverse cursed technique as a whole. Due to that, he is able to quickly deduce the inner workings of cursed techniques after only seeing them once or twice and creating suitable foils to such techniques. He did this against Mahoraga in their fight, and was able to defeat the shikigami after gaining an understanding of its technique.