Hila (DC)

Hila, known as Siren, is the twin sister of Mera. She is the leader of a death squad sent by Aquaman's enemies in Xebel to assassinate him. He first appeared in Aquaman #22 (August, 1965) and was created by Nick Cardy.

Earth-One.
When Mera's twin sister Hila is exiled with her lover Kandor for a crime that they did not commit, Kandor uses her to lure Aquaman into a trap to try to wrest from him the secret of the Seven Golden Eels. Eventually, Kandor, Hila, Aquaman, and Mera find themselves allied in battle against the menacing Armadillo Men. After their victory, they are approached by Aqualad, who tells them that Kandor and Hila have been cleared in their world. The two lovers decide to return home.

New Earth
She is a recurring character in Brightest Day comics.

Prime Earth
Aquaman returns to Atlantis, only to find a figure of Mera sleeping. Startling the female, the two would later converse about what has recently occurred with their kingdom. Finally setting aside their differences, Arthur would eventually have an affair with the figure. In the aftermath, Aquaman would only find that Mera had been kidnapped, and the figure reveals herself to actually be Mera's sister, Siren. Being locked into a battle after Arthur tried to interrogate her, Aquaman soon finds himself in a presumable alternate world.

Animated Appearances

 * Hila appears as the main antagonist of DC Super Hero Girls: Legends of Atlantis, voiced by Erica Lindbeck.

Live-action appearances

 * Siren (appearing in human form as "Nadia") appeared in the pilot episode of Aquaman, portrayed by Adrianne Palicki.

Video Game Appearances

 * Hila appeared in DC Legends.
 * Hila appeared in DC Unchained.