Joker
Sam Rockwell
or
Jared Leto
Both phenomenal actors both have played psychopathic murders Rockwell in The Green Mile and Jared in Lonely Hearts. Sam has the crazy funny clown killer style down and Jared can do the creepy unsettling Joker .
Riddler
Elijah Wood
Great actor and can play cocky, smart, and a douchebag oh and insane all at once. I think he would bring a new twist Riddler which I welcome.
or Benedict Cumberbatch
For this reasoning watch Sherlock.
Penguin
Bob Hoskins
Now, I know he is 71 but Oswald is always supposed to be older then Batman. I would of chose the late Phillip Seymour Hoffman. But Bob is a great actor and would make this villain threatening too.
About The Author:
I'm the more sophisticated version of the outlaw StarLord, I am Mr. StarLord. I am also Sid Da Sloths father. Your welcome everyone.