Garth and Neptune Perkins... two biological freaks of nature that do not fit into their natural societies.
Due to Garth's purple eyes which were considered a bad omen by his superstitious underwater society, he was left to die in the wild until found by Aquaman a few years later. Learning that the child was the son of King Thar and his mother Berra, both losing their lives to a rival clan conspiring against the monarchy, the boy named Garth would himself be the heir to Atlantean prince Arthur Curry aka Aquaman. Adopting a similar alias as Aqualad, Garth soon met fellow teenage sidekicks and joined the Teen Titans while developing his telepathic control of sea life. Ultimately, he ended up riding his mentor's shirttails rather than operate either solo or with the Titans on more than an occasional basis. Perhaps due to his derivative nature?
Neptune Perkins was a son of two oceanographers, born a human dolphin hybrid mutant, needed to remain in salt water for several hours a day. Gaining the ability to communicate with dolphins, Perkins eventually began associating with the All-Star Squadron infrequently on cases. Years later, he would be a semi-regular assistant of Hawkman on a couple of missions into alien environments.When this occurred, several years had passed since his initial meeting with fellow superheroes, and he had gained the reputation as a noted expert on various forms of life in the oceans of the world.
Each teenager gained the affection of water breathing females, Aquagirl and Tsunami. And each had limited fame while languishing in the shadow of the more famous kings of the sea.