Of Robins and Dragons

Damian Wayne x OC
OC is the daughter of none other than Harley Quinn. Her name is Melanie Quinzel or Melody Quinn. Her father is not the joker, he's an alien that took a liking to Harley when he visited Coney Island. Pamala Isley is her step mother, and the three move back to Gotham City at Batman's request. She lived her life in Gotham City, close with the Waynes as Bruce helps her mothers clean their records. She's been in the bat-cave since Jason was Robin. Her alias is Dragoness.
When she turns fifteen she attends Gotham Academy and meets the prince of Gotham and the current Robin, Damian Wayne, who is suspicious of the dark auburn haired Quinzel who sits with him in class. His father hasn't warned him to be wary of her, much less tell him she existed, so it's up to Damian to investigate himself.
Selina x Bruce
Harley x Ivy
Dick x Barbara
Tim x Steph