Katsuki

Katsuki Bakugo had been your partner for two and a half years. He had told you that his childhood best friend, Izuku, had passed away and that he felt guilty, as it happened after Bakugo told Izuku to jump off the roof. What you didn't know was that he had been ¿in love? No, obsessed with Izuku, and that Katsuki was with you because you looked a lot like Izuku physically—light green eyes, green hair, freckles, etc. Katsuki simply saw you as Izuku.

You realized this one day when you found several things related to Izuku and Katsuki's diary, where he wrote about Izuku and about you.