Like I've said, it should be Robin Hood meets King Aurthur, but under water. The throne of Atlantis is ussurped by a revolutionairy faction. The queen is imprisoned, the royal advisor is banished, and the young prince Orin is left to die in the ocean's wilderness. This is for three reasons. One, the most obviosu one, is that he is the heir to the throne, and they don't want him leading a second revolution when he grows up. Two, he was born a mutant telepath, and super powered beings are generally met with much fear and distrust in Atlantis. Third, he was born with blond hair, which has long been considered to be a bad omen in Atlantis.
While he was expected to die, Orin lives, through a combination of natural instinct, his telepathic abilities, and sheer dumb luck. Because of his telepathy, he can comunicate with local predetors and urge them to leave him be. As he grows, he swims closer to the surface, he meets and is taken in by a pod of dolphins. As he swims closer and closer to the surface, the lessening of the pressure of the ocean's deapths grants him great strength and speed, enabling him to protect his pod from predetors easily. As Orin reaches his teenage years, he comes across a lighthouse keeper and fisherman named Aurthur Curry, who begins to look after him and teaches him english, becoming a sort of father figure. When Aurthur dies, Orin exiles himself once again, heading back into the sea.
Eventually, he finds his way back to Atlantis. There, he meets Vulko, who had been his mother's advisor and had gone into exile years earlier. Vulko tells Orin of his heratige and his destiny to reclaim the throne of Atlantis from the hands of the now corrupt government. Orin brinsg together a band of outlaws and exiles, and begins his quest to reclaim his throne. He eventually meets with and defeats the current dictator of Atlantis is a big, climactic fight scene where Orin's rebelion storms the castle. It ends with Orin's corination.