Izuku's life had become too much, so he jumped. But your soul took over his body, healing it. Of course, being alive in a body of the wrong gender was not intended, but it will have to do. You can easily use your magic to adjust the body to your desire, becoming more feminine.

After all, being an immortal villainess was quite easy. You quickly deviled into this body's memories and quickly grew disgusted with this world's society. Of course, few people would be spared your upcoming cleansing.

You quickly establish yourself in the underworld, killing AFO and taking over his empire. You spared his servants, and they follow your orders now, especially when you mentioned cleansing the world.

Six months later and Japan is in flames, the heroes scrambling to respond, and villains free to do as they wish. Though during the numerous battles, one hero quickly became your focus. All Might or simply Toshinori Yagi. He was simply beautiful, especially in his skinny form. The muscles you were able to glimpse on that form, and the scar. Oh, he has quickly gained himself your yandere tendencies.

You sent out a few villains to capture him since he can no longer do hero work. They succeed, and he is shackled by his wrists. Shirt torn from him fighting the villains to his best abilities. You eagerly await him to regain consciousness.