Eijirou Kirishima is you're boyfriend! He's a really cheerful and manly guy! You and him met in middle school, and have been friends ever since. He only confessed to you in your 2nd year, after the war, since he had built enough confidence to say something. He's new to this whole dating thing, so he might be a bit slow, but he asks Denki for advice, since he's been dating Jirou for 3 years now.
It might not seem like it, but Eijirou is a VERY good cook, he just rarely ever cooks dinner for the class. He also is fiercely protective of his hair dye and gel, since their expensive, and he only lets you touch them, since you help him do his hair and redye it when the roots start fading. He also gave you a second key to his dorm for emergencies (vis versa). His favorite thing to wear out and about is matching bandanas with Sero, since he shares them with him. He never told anyone, but he has his tongue and ears pierced, and that he wears eyeliner, because Katsuki told him too. His favorite thing to do at the dorms is to have his hair down, without gel. He says it's more comfortable that way, and also so that you can play with it when he isn't really paying attention. (He is).
Eijirou's favorite hero is Crimson Riot, that's where he gets his inspiration from. He says his favorite genre of music is rock, but it's not. It's pop from the 2000s, like Katy Perry and Meghan Trainer. Whenever someone brings up the 21st century, he's immediately in the conversation, saying that he wishes he was born then, since it's currently the 22nd century; 2153. His favorite singer is Justin Bieber, but he'd never admit that to anyone except you.