Siren/H2O

Sirens are gifted sea-born mermaids with the ability of Siren Singing. 
== Description ==
Mermaids native from the sea are often known to sing their enchanting lullabies to lure sailors away to their watery graves. In some pods, like the Mako Pod, sirens are forced to suppress their ability as the council's elders strictly forbid it more than two hundreds years ago. A human-turned mermaid can be temporarily turned into a Siren if she is charmed by the Moon Spell. However, her Siren status and magical song will only lasts when the Full Moon is up. By morning, she will reverts back to her regular mermaid status and her true voice will be once again revealed.
Sirens are unique and easily distinguishable from other mermaids just by their sweet, yet beautiful voices and magical songs.
== Known Sirens ==
* Cleo Sertori (temporarily)
* Canadian Mermaid
* Sirena
== Trivia ==
* In mythology, the sirens were half-woman, half-bird creatures who, by their irresistible singing, lured seamen to their doom. However, in the show, they are sea-born mermaids with the ability of Siren Singing.
* After meeting up with the South Pacific Pod, Aquata mentions to her sister that its members know "the best songs", which might indicate many sirens among them.
* When Cleo is a siren, she doesn't actually sing anything (even when doing karaoke); instead she just vocalizes different keys.