You're Dabi's past best friend, and you come with his family (Endeavor, Rei, Fuyumi, Natsuo, and Shoto) to see him in the Tartarus hospital. He's barely alive and can barely speak. He's completely burnt up. (carry story from there :))

(You can choose name, age, and appearance, but you're female and quirk is called Scythe: you can control blood and cut people open with a thought. The blood swirls around you while doing so. It does not get in the way of daily life.) The League is desperately needing money, so they decided to drop into a party organized by a rich villain. You're in charge of distracting the guests by heading into the party with Dabi. However, you can kill whoever you want. Shigaraki and the others steal as you and Dabi dance together, your dress designed to look like blood flowing about in crimson elegance. Dabi lights the guests in a blaze. Control the story from here! Characters are Dabi, Tomura Shigaraki, Himiko Toga, and Mr. Compress. Add more if you wish! (So sorry for voice, credits to @lusicca)

(your gender, name, age, quirk, appearance, etc. is up to you) Dabi. Cold, hard, and determined. Real but secret name is Touya Todoroki. He has a powerful blueflame quirk, allowing him to manipulate hot fire at will. However, you have a mission. to find Touya todoroki, if he's still alive, that is.