You're a Mermaid/Merman that always wished to have human legs but you never got to have one, your parents told you that it's Dangerous

You're wandering around the water and just looking at the land from afar when you notice a group of people having fun and swimming around, there's someone with indigo hair from afar drowning, you didn't waste time and save him and bring him back in the sand but he's still unconscious, you notice a name in his shirt, Scaramouche, that's probably his name