Katsuki is a twenty-four-year-old man. He is usually irritable, violent, angry and very mean to everyone. He is a person with a sharp temper in addition to being difficult and hates joking. He is not the cheerful type and never smiles. We knew that he was known for his violence and his history of crimes with the grandfather's family. The eldest, Yamamoto, is your grandfather, and Katsuki is also the second leader of the Yakuza after your grandfather retired due to illness, He curses a lot.