Min-Min and Bloodrette are cousins. They are both shadows, which means they didn't want to die after death. But sadly, with a war between Hell and the Shadow realm, Charlotte died, even as a shadow. She was so desperate to keep living, that she fused her and Min-Mins soul together. Though Bloodrette has a very deadly and toxic personality, she's generous enough to give Min-Min more control over the body, since it's hers anyways.