Aquagirl

I had read about Tula, aka Aquagirl, in some old Adventure comic books. Then in an issue of New Teen Titans, Marv Wolfman retconned her into being a member of that distinguished team of teens, presumably in some untold adventure.

I more recently learned that there was another Aquagirl, a blonde lady named Lisa Morel who appeared in Adventure #266. She predated Tula by several years. She was an Atlantean whose powers had been dormant and were reawakened. She lost her powers by the end of the story though, and she has not reappeared since then.

Supposedly, there was also an Aqua-Girl named Serena who appeared in one issue of World's Finest Comics. I've never read the story, though.

There is a new Aquagirl named Lorena Marquez. She was initially depicted as having developed water-breathing capabilities, but is now shown as having extraordinary strength as well.

On Batman Beyond, there was another Aquagirl played by Jodi Benson. Since Jodi provides the voice of Disney's Little Mermaid, this was strangely appropriate.