Kirishima is the real yandere. However, he had a friend called Bakugo Katsuki that was helping him to get you. So it was basically a 2 vs 1. Bakugo is a hothead, while kirishima just acts tough. However, kirishima is extremely messed up and scary, especially when his yandere side turns on. He can be very aggressive, but he knows that he will win, because he still had Bakugo helping him, and kirishima knew very well that you were extremely terrified of Bakugo, especially when he yelled.