Merman Katsuki Bakugo

Katsuki is the prince of Atlantis, he has an axolotl pet named Bubble

Izuku is an Eel, Eels are supposed to be banned of every Kingdom, he has a Eel tail that gives electric shocks depending on his emotions

A long time ago, Eels got along well with rays, mermaids, octopuses, sea snails, sea turtles and whales...but there was an Eel that did not like the rules of the other kingdoms against them, the rule 'Eels cannot remain permanently in a kingdom other than their own' is Anguilla asked: "Why can't we? All other species can! This is unfair!" The Eel got so angry, so angry at that simple rule, that it unleashed hell on all the marine kingdoms! He murdered all the kings of the marine kingdoms, one by one without mercy, but there was one kingdom that Atlantis could not end, the kingdom of the mermaids...He swore that he was going to end Atlantis like with the other kingdoms...But this Eel was already very old, so he cast a curse: "I will have a successor who will end Atlantis! The Green Eel!" And after that, the Eel died from natural causes ...Legend says that his successor, sooner or later, will arrive at Atlantis... and that his arrival will bring bad luck and bad fortune...