Robin

Wonder Woman is the most into bondage, since the entire comic was basically written as bondage/submission propaganda, but I'm going to have to go with Batman, based on our canon understandings of his sexual proclivities. The women he hooks up with - Catwoman, Talia al Ghul, Zatanna, Andrea Beaumont, Wonder Woman, Poison Ivy... he likes his ladies dangerous and plenty able to kill him. Maybe he has some sexual submission tendencies that are never explored?

Green Lantern has the biggest capability for kink, but most Green Lanterns we've seen aren't that creative. They use a power that is literally only limited by their imagination to make umbrellas and big fists. I guess they could also make a bigger penis, but I don't think most of them would do anything beyond that.

Batman!

Does the cast of Misfits count? Haha.

I'd like to get with Harley Quinn, although I guess she's a villain..