Worlds Apart - Mer Izuku x Shouto

When Midoriya was four, he was told he was quirkless. Shortly after that, he drowned. When he woke up, he had a tail instead of legs, and he had been saved by none other than his idol, All Might, who had been thought to have died several years before.
Time passes, and he becomes accustomed to living in the sea. One day, he finds another boy sinking just as he had. A boy with white and red hair. Taking his chance to actually be a hero, he brings the boy to shore.
Years pass, but Midoriya never forgets the boy with beautiful multicolored eyes, the one person he got to save. As he gets older, he finds himself wondering if he would ever meet him again, but knowing it was futile to dream, when they lived worlds apart.

I do not own any of the characters. BNHA belongs to Kohei Horikoshi, and as much as I wish I could prevent him doing absolutely evil things in the manga right now, I have no influence over the cannon.