Gravelord

The Joker, easily. He is the representation of comic book villainy in my opinion.

Don't really like some of the other options on the poll like the Anti-Monitor who lacks any sort of meaningful character development.

Asura

Harley Quinn appeals most the casual audience these days with her anti-hero portrayal and badass attitude. She will pretty easily shoot to the top if SS is a success (it will be) and Margot plays her well (seems like it so far).

I was just about to post that. So nonsensical it makes me cringe whenever someone suggests it.

Arkham City and it really isn't even close.

Titania

Shield

Of course.

I don't think it will be an all-time classic as some are envisioning it to be, but it will still be a pretty damn good game, despite the shameful amount of DLC packs already.

Invincible

Mjolnir