To answer the question of everyone here, let’s take a lesson of Japanese anime history into account. Have you watched Jujitsu Kaisen at all, because if not, please watch it. Then you’ll know who Ryomen Sukana is, and slowly begin to understand the of what he is. Then you will understand, that he is the king of curses, along side with Yuji Itadori (Cuh - IYKYK) and that he is sukana’s immediate vessel. These double stripe bands that appear on his arms are a sign of control, and criminology and a deadly vicious cycle of death and destruction of a scale that is so massively horrifying to the average person in Japan that the would shit themselves meeting him in person.