"you know if you really want to be a hero that badly there might be another way, just pray you'll be born with a quirk in the next life and take a swan dive off the roof of the building!"
"So no I honestly don't think you can become a hero without a quirk." Izuku stood at the railing, red shoes tied together as an awkward bola. With a quick throw, the shoes flew from her hand and were caught on a power line. Next, izuku slips on a pair of old shoes. She doesn't say anything, instead just going over to the edge and looking down. Something had exploded and now everyone was either going towards it or away from it, the rooftop she was on overlooked the space in-between, a street no one had stayed on. She leaned forward and fell, then everything went dark. Katsuki couldn't breathe, no matter what he did with his quirk he wasn't making any progress getting out of the slime trying to force it's way into his body. He kept trying though, heroes win, therefore he would win because he was going to be a hero, it was that simple.
He lets off a particularly large explosion, well over his usual limit in desperation. The blast shot through a wall and ruined the support of the rest of the building. He heard screams as bricks entered his view, then a bright light as the gas lines leading to the building were exposed to fire. The blast forced the slime off him and launched him into the wall, his head slammed into the bricks, and everything went dark. Toshinori's eyes widened as the alley exploded, then widened even further as he felt the agonizing pain in his left side. He looked down as the people around him screamed and backed away from him, rebar, right in his old wound.
He dropped to to his knees as blood pooled in his mouth, spilling through his teeth and dripping down his chin. He opened his mouth and let the blood out before he started to drown in it. He pulled out his phone and hit the button to speed dial recovery girl. He hoped she'd make it in time as he fell to the ground, and everything went dark. Izuku opened her eyes and saw the sky, as well as the buildings around her, she didn't feel anything though. At first, she wondered if she messed up if she really was so useless as to screw up committing suicide despite jumping from a five story building. She forced herself up and noticed the sheer amount of blood around her, why wasn't she dead. Her hands seemed pale, and she felt cold. She grabbed her wrist and couldn't feel her pulse. Her hand shot to her chest, no heartbeat. She died, but she came back... She got up and ran over to a window. She was pale, her face had red, fleshy looking stitches where it must have split open, she looked over her arms and legs, finding more stitches where she figured bone had broken and ripped through her skin. A scream ripped through her throat and past her lips, after all the pain, all the insults, she finally found her quirk. Katsuki woke up in the remains of an alley. Just in time for people to pull him from the debris of his explosion. He shook his head and looked around, not sure what had happened, or who set off the second explosion. His eyes widened as he saw the damage. There were bodies everywhere, the various heroes trying to find survivors, to help them stay awake until emergency heroes and ambulances could arrive. People were burnt, impaled, missing parts or chunks of flesh or a mix of all three and worse. The heroes who pulled him from the rubble dragged him to the rest of the survivors and headed back into the alley to find others. He wasn't stupid, his eyes found where he'd been trapped, where his blast would have gone, remembered the fires and how there had been screaming before the blast. How one building was more destroyed than the rest and right in the path of where his explosion would have gone. It took him a moment to realize it was him screaming, the cool feeling on his cheeks was his tears, as he realized the consequences of his quirk.
Toshinori gasped as he woke up, recovery girl kneeling over him, he was honestly surprised. He sat up with her assistance and nearly passed out again. The devastation around him, all because he couldn't save people anymore. He'd failed. He heard as he realized what his quirk had done, but it was just as much his own fault. He had stood there wallowing in his own weakness rather than risking it all to save lives. He thought about his power, how it had given him the strength to stand above everything as a symbol of peace. Of course he didn't risk anything, he's never known risk. What risk is he taking going up against villains, himself having enough power even now to completely rearrange the entire countries weather patterns with just a single punch?
His own scream ripped through him, what kind of a hero was he if he couldn't even use his quirk.