Harleen Quinzel was a former Pyschiatrist at Arkham Asylum. Her patient was the Joker and he told her all his "secrets" and eventually she fell in love with the Clown Prince of Crime. Harleen Quinzel adopted the name Harley Quinn and broke the Joker out of the Asylum and became his assistant.

A brilliant botanical biochemist, Pamela Isley is a fervent eco-terrorist out to save the world's plant life by any means necessary. She often finds herself at odds with Batman, though they have, on occasion, fought on the same side. She has had a long friendship with Harley Quinn and is responsible for Harley's meta-human abilities. Ivy, Harley, and Catwoman later teamed up as the Gotham City Sirens. Post-New 52, she was a member of the Birds of Prey for a time before betraying them to further her cause.

This is a very lewd interpretation of the characters,hope you enjoy it.