Dabi and Maddie: Lone Dabi and Cub

Maddie is a girl recovering from an abusive family who is now living with one of the most powerful and infamous villains in Japan. The villain in question is named Dabi; a villain notorious for burning people alive and leaving their corpses to rot. Despite him being a murderer and having no compassion for anything, he still has room in his heart for Maddie. Both have suffered from abuse and escaped it, so they understand one another and end up needing each other to feel happy. Dabi realizes how great it is to have someone to love, and Maddie gets the love and protection she's always wanted. Now Dabi won't let anything happen to her and the two plan to spend the rest of their lives together.