If Harley Quinn was in Batman 1989
I know it wasn’t possible at the time of 1989 due to the fact Harley didn’t exist back then
That being said though say If Tim burton had included her in the first film along with the joker it could have worked although some say it wouldn’t but I think different they could have taken out Alicia and put Harley in there
Perhaps have her as a dr treating patients who had been admitted due to claiming to see the Batman and as a result of no one believing them they were considered insane and sent to Arkham for this could be where Harley hears the story of the Batman
She could cross paths with the joker who takes a liking to her and gives her a choice to join him in running the city to the ground or she stays as she is
Harley likes the joker because he listens to her unlike past men in her life and falls head over heels
That’s just a idea I have it doesn’t mean it would have made the film better I for one loved the first film, The dark knight also
Having been born in 1988 I didn’t get to go to the theatre to first see it instead watch it on vhs and I was blown away by how good it was
I still think perhaps they would have included a love interest for the joker think of it as a Bonnie and Clyde type of duo