Lisa Morel is introduced in Adventure Comics #266 (November 1959) as one of several violet-eyed Atlantean children born unable to adapt to the watery world.
Selena is a young Poseidonis teenager who temporarily teams up with Aquaman under the name "Aqua-Girl" in World's Finest Comics #133 (May 1963) to make her former boyfriend jealous; she succeeds, making Aqualad jealous of her temporary status as Aquaman's sidekick as well.