I've dabbled with the thought that Sona is actually the etwahl.
Impossible. Sona's body is far too curvaceous and voluptuous to be possessed by a horizontal harp.
I just hope they don't make Aatrox inexplicably evil. That would just be too cliche.
I feel like it's more of a perspective kind of evil. If you happen to be the side that he's supporting in battle, you'd probably lick his feet in praise. If you're going against his supported army, you're going to think he's a pretty bad egg.
From what he is right now, he just lives to fight, as like a weapon. Good/Evil doesn't really matter or apply to him. Battle is all that really matters to him.
Tl;Dr: Chaotic neutral. Morality doesn't apply to him.
DemonBlade Trynadamere
Varus corruption man.
Or he just has the same theory as the community.
Well if you only live for the fight doesn't that make you a weapon?