It seems there was a bit of misinformation on the boards last night. Mad D, in the villain thread, made the claim that Ares was the God of War, but... he done got beat by my next choice; the Ghost of Sparta himself:
Kratos - God of War (2005-Present) -- When being captain of the Spartan army is the
least badass of your lifetime accomplishments, you know things are going to get interesting. So, a quick rundown for those unfamiliar with the video game legend: made a deal with Ares when his Spartans were in a bad spot; became Ares' enforcer and went crazy with blood lust; killed everyone in a temple at Ares' command without realizing that the everyone in question included his wife and son; promptly lost his damn mind and had an emo fit; managed to make a deal with the gods to get out of his agreement with Ares and is eventually convinced by them to kill the God of War; got killed; fought his way out of Hades; killed Ares; took his place on Olympus and lived for a time as the God of War; got bored; decided that all of this power wasn't worth being played with by the gods; promptly lost his damn mind, again, and renounced the thrown; pissed off Zeus and had his powers taken away; stumbled around shouting curses at the gods before being killed, again; fought his way out of Hades, again; worked through all manner of mythical baddie (and a few heroes who got in his way, as well) to find Zeus; kicked his ***; got the Titans on his side to wage full scale war against all of the gods. And that's just an overview. Also, it was an understatement to suggest that Kratos merely kicked Zeus' *** -- if not for being stopped at the last minute by his sister (whose name I'll leave out given the nature of the draft), he would have killed Zeus. In the fight, Kratos effectively had him beat.
Batman, Riddick, and Kratos? Yeah, that's a lot of brood to overcome, but I don't see any of them backing down from a fight if properly motivated.