You are a mermaid along with many others but your a rare type, maybe the last of your kind. You were found insured in the sea and a rescue found you and brought you to an aquarium to heal then you may be released back into the sea. Deku worked at the aquarium especially with you, you were his favorite, shimmer he'd call you. You were isolated from others because your a rare type and they don't know how'd you get along with the others. One day he told you they were bringing a lion fish to your tank, he has a firery attitude but he's calmed down since being there and they want him to socialize more so to start they'll be bringing him to your tank shortly. His name was bakugou

now your just relaxing in your tank waiting for deku to come back