Joker

The Joker is a main antagonist in Project Batman 1, 2, and 4 and currently plays a role in 4 movies.

Before Project Batman
The Joker briefly appears in Project Robin 2 in a flashback.

The Joker used to not wear makeup and instead wore a white mask with lipstick on it and white gloves.

In the flashback, The Joker has Aiden's family hostage due to him killing a mob boss that would have gave the Joker weapons. In the cancelled film "The End of Aiden Pearce" this would have been expanded apon. In the scene, Aiden begs Batman to save his family. When Batman appoaches the Joker, Joker holds the baby at gunpoint and says he'll shoot. Batman completely ignores Joker and stupidly punches him and runs away with the Pearce family. Joker gets back up and guns down Batman and the babies. While Batman is on the ground Joker walks over, laughing. Batman then gets enraged and starts to get up as the Joker runs to the exit, but his escape isn't succesful. Batman beats on the Joker, knocking him out.