Crimson Longinus
Legend
And I'd say that alignment is bollocks and it is unhelpful to try to force characters into it.I missed that debate but it is a good question.
On the one hand, the relationship of Darth Vader to his Sith mentor is Chaotic Evil.
On the other hand, the relationship of Darth Vader to the Empire is Lawful Evil.
I would probably say he is Neutral Evil.