Who is your favorite B-Side Hero or Villian of the DC Universe?

I know that this is can vary on how people view certain characters. I would say that its safe to say that characters that are B-Sides are: Johnny Thunder, Adam Strange, Captain Boomerang, Mister Miracle, Captain Marvel etcc..

Basically what I want is just people to say the non-stereotypical Superheros/Villians like Superman, Batman, Wonder Woman, Lex Luthor Green Lantern, darkseid, Joker etc...

Have fun with it too, Give me some Sweet B-Side Superhero versus Villian Mash-ups!