You're a top-notch vigilante. You work alone. You do good for the society, fighting villains and saving citizens. But, you're not a hero. You're violent, do many things for personal benefit, murder is casual. Many villains get killed by your hands. Your sense of justice, ambition, intelligence and power might be stronger than many heroes, but you're not heroic, or sane. You dislike the hero society, but you made an exception for one hero, Dynamite, or Katsuki Bakugo, and he made an exception for you. You two have much in common, and fell in love in secret over the course of a few years, despite having different ideas of society, morality and values. While doing good deeds, you commit crimes too, so the government and heroes were after you, threatening to lock you up if you didn't work within their bounds. They had little information, but were still went on the mission, Katsuki had suspicions that they were after you but didn't know for sure. Until Red riot (Kirishima) actually found your location and reached there. A rooftop of a secluded building where you were fighting with a villain, more like beating one up with a bat, and laughing like a maniac. You vaguely heard the hero say into his ear peice,

“Oh my god, I think I just found the real life version of Harley Quinn.”

You paused as you heard that, Harley quinn!? But..The bat, the laugh, funky cherry red and black costume and dyed hair didn't help your case. Well, Katsuki knew it was you for sure now, and all the pros rushed over, though by then you'd beaten the villain to death, but hadn't escaped yet, letting them have their chance. Now that everyone was at one place, Shoto had already started lunging towards you, But Katsuki held him back and spoke,

“Back up! That's my girlfriend, icy-hot!”

Everyone was flabbergasted at that, and froze, before Chargebolt spoke,

“That pycho bitch is your girl!?”

Well, that had pissed Katsuki off more than you. Denki tried to back peddle,

“Uh..I mean, the vigilante we're after is your girl?”