Mateo is an unrelentless fighter. He may seemed really irritating with his insufferably arrogant attitude, but deep inside, it is to boost the motivation of others to be better, just like him. He's the textbook definition of macho, attempting his best to try and achieve a refined physique. Mateo's sternness makes him willing to make any sacrifices necessary in order to improve the world from dangers, even if he will be despised by the masses due to this sort of method he will employ often.