Gotham City Sirens

Gotham City Sirens is the poly ship between Selina Kyle, Pamela Isley and Harley Quinn from the DC Comics, DC Animated Universe and DC Super Hero Girls fandoms.

Canon
Catwoman, Poison Ivy and Harley Quinn are three of the main female villains of Batman's rouges gallery. From time to time the three would team up whenever their paths cross or are in need their unique skills set. Along with the three simply hanging out as friends. After Harley and Ivy turned from best friends to girlfriends, Catwoman became their supportive friends of their relationship. Her support of the two can be seen in DC comics of the three and the 2019 Harley Quinn animated series.

DC Super Hero Girls
The three have appeared in both versions of the DCSHG universe. The original 2015 web series having the three Gotham girls learning how to be heroes than villains at Super Hero High, while the 2019 cartoon reboot has them remaining villains and became members of the Super Villain Girls. After they moved from Gotham to Metropolis.

2015
The three aren't seen spending time together on screen, since Catwoman is mostly off doing their own thing while both Ivy and Harley being two of the seven main Super Hero Girls in the 2015 series has them being given the most screen time, out of the three Gotham villain girls. Even though the web series doesn't have the three being seen in the same scene together, Catwoman does mention her being in a study group session with Harley and Ivy. Revealing that the three do find time to hangout together off screen.

When Catwoman noticed the golden amulet around Ares's neck she hatches a plan to steal it, while using the "Gotham girls sticking together" saying to get Ivy and Harley to unknowingly help her. As she asked Ivy for a gas bomb and despite the many times Catwoman has asked her for catnip and refuses to grow some for her, Ivy gave Selina what she asked for, even though she had no idea what Catwoman planned to do with it. As for Harley Catwoman tricked her into into serving as the destruction for her plot, while making Harley think that she was auditioning for the role of a damsel-in-distress in a play.

Harley Quinn (2019)
Even though the series mostly focuses on Harley and Ivy, Catwoman does appear in it every now and again when she is either helping them out or is simply hanging out with the two as friends.

Fanon
Catwoman, Poison Ivy and Harley Quinn are considered to be three of the most popular female villains within the Batman side of the DC universe. Possibly due to the times when the three have teamed up with one another and coming from the same city. Harlivy fans also like the way that Selina has served as their supportive friend and possibly a Harlivy shipper herself. In the Greek myths there are three Sirens, who are said to posses beauty in order to lure in their pray and are one of the many monsters from the ancient Greek world, hence why the three Gotham woman have been dubbed as the Gotham City Sirens. As the three have used their beauties traits to lure in people they wish to harm or steal from.

Fandom

 * FAN FICTION

Variations

 * CatQuinn — the ship between Selina and Harley
 * Harlivy — the ship between Harley and Ivy
 * Pamlina — the ship between Pamela and Selina
 * Super Villan Girls — the ship between Selina, Harley, Pamela, Carol Ferris, Doris Zeul and Leslie Willis