What is Eri like in your Merfolk MHA AU?!?! I always pictured her to be like Ariel or the cutest mermaid ever!!!
Eri is a human, who Nemuri and Hizashi find on a little rowboat floating in the sea. Nobody knows for sure how she got there, but Nem's theory is that the boat or ship that she was on originally sank and the rest of the crew pushed her out on the rowboat to save her.
They take her to Aizawa since they can't take care of a human child underwater, and he helps take care of her and find out what happened / reunite her with her parents / find her a new home. She isn't very talkative but she likes Souter and her weird fishy aunt and uncle.
Also did a mer design of her for what she would look like if she were a mermaid. Not canon to the AU but whatever. She's just a babby.