At first, Katsuki had shown to be highly arrogant and condescending towards almost everyone. he was also incredibly condescending towards others. however, after receiving several blows to his pride as well as (to a point) deflating his ego, these behaviors have reduced mostly, now less smug and more serious about his aims as well as taking others into consideration. Katsuki later reveals that he had been holding immense guilt about bullying, and even blaming himself for other issues.