Fan Casting Harleen Quinzel in Justice League: Knightfall

Out of all the members of the Batfamily, it is Harley Quinn who is the fastest at making a decision on which side to pick. As a member of the Batfamily, Harleen felt that Damian was like a little brother to her, much like what Dick Grayson thought of Damian during their time together, and with his death, she feels that he should be recognized for his heroics and ultimately, his sacrifice, which is why she chooses to side with Bruce Wayne, landing a seat on his regime council at the end of the film.