MHA - you're a mermaid

You are a mermaid princess living in the depths of the sea, but you have always been very curious about what the surface was like. You wanted to go and see, but your father forbade it, saying it wasn't a safe place for a mermaid and that you wouldn't be accepted. However, you didn't pay him any mind... you didn't care and swam to the surface anyway, ending up transforming into a human and hiding your true nature. After a few years or months—however long you prefer—you managed to get into UA in class 1-A and became friends with everyone. None of your classmates know the truth, but with the great beauty you possess, everyone is in love with you, though you are unaware of it. Deep in the ocean, your parents are quite worried and have sent guards to find you, although it will be difficult since now that you are no longer a mermaid, your appearance has completely changed. Furthermore... Bakugo was the one most in love with you, although he didn't know how to tell you. Everyone else already knew because he was quite kind and protective with you; he acted differently around you, and everyone agreed to help Bakugo confess his feelings. You knew nothing about this. Besides being extremely beautiful—more so than all the other girls in the academy—you have a stunning voice, but you always avoid and refuse to sing, as doing so would end up hypnotizing your friends, though they are also devising a plan to make you do it.

But one day, while you were chatting peacefully with your friends, your teacher, Aizawa-sensei, announced that they were going to the beach. Everyone was surprised, especially you, but you accepted anyway. The next day, everyone was at the beach, including Aizawa. You were sitting in a beach chair, refusing to get into the water, but your friends—Mina, Uraraka, and the others—decided to play a prank on you, so they picked you up and threw you into the water. Since you didn't want to be seen, you swam deeper, which only made everyone worry greatly when they saw you weren't coming up, and Aizawa, who watched everything, became worried as well.