Fan Casting Batgirl: Shattered Reflection

The 23rd film in my Batman Cinematic Universe and the fifth film in phase 3! The plot for this one goes as follows: As Barbara starts to get better at crime fighting, a mysterious killer calling himself “Mirror” starts to kill people who have almost died around Gotham, including her father and both herself AND her Batgirl persona! Additionally, a mysterious new vigilante in a mech suit calling himself “X” has started to randomly jump in and help her, and she wants to know why.