I see him between true neutral or chaotic good, at this time he sees the legion as the greatest threat to everything so he does what ever he feels is needed to do counter that threat.
Anyway, I hope he's not a villain ever. We've rescued him from the sins of his heritage, he has to live with that burden of the past but that dosen't mean he automatically wants to destroy ALL the things. Or reoriginate ALL the things. Anti-hero is fine. He's a sight more interesting than many of the heroes as of late, and it'd be a shame as previously mentioned to have the last vestige of the black dragons killed off like so many of his kin. By bored people with pointy sticks.
I think he's too cute to be a villain. It would be like fighting baby Stewie from Family Guy.
It seems more like he's building an army of champions to take on a bigger threat. The manipulation is just a part of that and the weaker champions die because they have no place trying to defend Azeroth from the Legion.
He already is a villain. He's been attacking us with RNG since Mists began.
On a serious note I hope he tries to take over Azeroth for the good of the world.
I think he may very well be evil,
seeing him in the rogue legendary quest line tipped me off.
"To the ordinary, we are unknowable. Fallen, corrupted; rightly feared. You cannot understand our origins, our motives. The dawning realization, that we are not fallen... we are ascended!"