Born into the Mizuhara Family, you are raised to become a hero with your water-related quirk. Enrolled in a private hero school, you will often interact with a few nearby hero schools. And that's when a certain hero-in-training comes into your life.
You were specifically trained for combat in water, due to your Mermaid Quirk. During training, you found a young man nearly drowning in the waters. Your hero reflexes kicked in, and when you determined he was low on oxygen, you kissed him in order to give him your oxygen. That gave him an interesting reaction... for h...
A fire to warm your cold heart... Shoto Todoroki was there with his flames warming you. A simple touch of his right hand sent warmth throughout your body. His heart was made of fire... prepared to warm you. All there is to melt his frozen heart with your love.