Kratos

Surprisingly, for the protagonist of a series titled God of War, Kratos's status as a War God is pretty complicated. After defeating Ares, Kratos himself ascended to godhood and was awarded with the mantle of the God of War—considering how much of a Blood Knight he was even as a mortal, it's a title all too fitting for one such as he. However, his resentment of the gods leads him to abuse his power, to the point where he begins a Divine Conflict against all on Olympus when Zeus retaliates by stripping him of his powers and sending him to the Underworld. In subsequent Greek entries after II, Kratos is no longer addressed as the God of War, but is still addressed as a god because of his inherent divinity as Zeus's son. It's also implied that his killing of Thanatos ascends him to the status of a straight-up Destroyer Deity, embodying both Death and War. By the Norse Era, Kratos no longer wears the mantle of the God of War because he decimated his whole pantheon, but his Character Development by that point has shaped him into a world-weary man who's just plain tired of conflict, much like a soldier who's suffering from PTSD long after his war has ended. So while he may no longer be the God of War in terms of title, it can be argued that he's almost certainly an embodiment of the glory to be found in a war, the rage and suffering that spurs men to begin one, and ultimately the consequences one must face when it ends.

Example of:
War God