Honestly I don't remember King Snake so that's why I didn't mention him.

A Batman villain I really like that unfortunately the comics have never tackled yet was believe it or not from the Adam West TV show: Bookworm. (Played by Roddy McDowall.)

He's one of those classical Golden Age villains that's so ridiculous, it's adorable. Photographic memory of every book he's ever read, staging crimes using that knowledge. His Achilles heel is that he lacks Zero original creativity, going into crime after a failed career as a novelist, a detail I rather enjoy.

I think he's asking for a good "reboot" into the Batman comic universe.