Poison Ivy- Barbara Palvin
Harley Quinn- Margot Robbie
Joker- Jared Leto
Batman- Ben Affleck
Catwoman- Olivia Wilde
Penguin- idk yet
The Riddler- Jim Carrey
TwoFace- Aaron Eckhart
Jodelle Ferland- Batman's daughter
All of these characters just popped up in my head....there will be other characters as we go along :)