Talk:Rarity/@comment-26973802-20140309033836/@comment-4531340-20140309035256

I believe both of those were discussed and it was determined that it would not be appropriate to categorize them as antagonists, whereas categorizing Rarity under antagonists because of Nightmare Rarity is being consistent with Luna and Nightmare Moon.

Also, the comics are official; "canon" never comes into it as that's an in-universe term that attempts to determine what's true and not from the perspective of the fictional universe.