There’s only one reason why BoP Harley can’t be in the Battinson universe and that’s because if she saw Batman, she’d immediately recognize her celebrity crush and chase him down the streets of Gotham with an autograph book
Source: “I named him Bruce after that hunky Wayne guy.”
So they wanted a real hyena to play Bruce in Birds of Prey so Cathy Yan and Margot Robbie went to see one that had been in a film before and when they saw it, it was sitting in a bathtub, which inspired Bruce’s bathtub scene.
They decided it was too dangerous to have a real hyena on set so they used CGI on a dog instead.
Who else feel bad for Geronimo in "Run for Hills, Geronimo!" book and really pissed off at his family and friends?
In this book, Geronimo just simply wanted to have a relaxing vacation. But, No! His family dragged him into another adventure against his will (They canceled his initial first-class ticket for some cheap plane). And during the events of the book, he was ripped off cash, humilated and physically traumatized several times by his own family and friends and even used as a practise doll for karate moves by Bruce Hyena and Wild Willie. I read only about 15 books, but that was probably one of the worst adventures Geronimo has ever gone to. At least, at the end of the story he decided to give Trap a piece of his mind using stuffed mountain lion.
² Father of Harley's children. Deceased, thankfully.
³ Secret daughter of Harley and Joker, she is being raised by her adoptive mother and aunt Delia.
⁴ The son of Harley Quinn and The Joker.
⁵ During Joker's time as Jack, he and Harley had two children, a boy and a girl that remain unnamed. Harley is forced to raise them alone after Jack's death in Sean Murphy's Batman: Curse of the White Knight #6.
⁶ The biological son of the Joker.
⁷ Harley's two granddaughters.
⁸ Harley's father, he disowned his daughter.
⁹ Harley's mother, she disowned her daughter.
¹⁰ Harley's biological brother.
¹¹ Harley's sister and adoptive mother to her niece, Lucy.
¹² aka. Poison Ivy. For more info. see here.
¹³ Harley and Joker's pet hyenas are numerous, they also have the Joker Fish if you want to count them as pets. For more info. about the Clan see here.
¹⁴ Harley's babies, a pair of hyenas.
¹⁵ He is a hyena previously owned by the Joker, it carries that Harley was also his primary caretaker.
¹⁶ Harley Quinn's pet, he is a spotted hyena; that she bought after her break-up with the Joker. Named him Bruce after Bruce Wayne.