The God of war, carnage and bloodshed.
Historically he's been Wonder Woman's big bad, but the New52 recast him in a more ambiguous light. Personally I see him as the embodiment of carnage, at least that's what the ancient Greeks saw him. This is in stark contrast to Athena who embodied the more rational elements of combat. I feel Perez's Ares fits that role better then Azzarello's. I also feel WW needs all the heavy hitter villains she can get, and turning Ares actually agitates the problem rather then helping. To me He should be on the level of Darkseid, Mongrol and the Anti Monitor. A truly cosmic menace. I feel he has more potential in that role then as one of many ambiguous gods in a large pantheon.