at first katsuki is shown to be a very arrogant japanese 16 year old boy however as he spends time at the hero school UA his ego lowers slightly and he appears less smug and more determined. despite this he is still know to be rude to people he doesn’t know well and often calls them “extras” kastuki only seems to become fond of people if they can impress him with their strength. katsuki is very aggressive and determined. katsuki thinks very highly of him self and aspires to be number one hero.