Antagonist Heroes

Antagonist Heroes is the exact inverted opposite of a protagonist villain: a character who is in the opposition to the protagonist yet is heroic in nature; this is usually due to the protagonist being a villain protagonist, and not the "anti–hero" type either, but a true villain, but there are conflicts where both the protagonist and the antagonist are heroes. In short, antagonist heroes are heroes who oppose the protagonist.

For obvious reasons, these characters are rarely Pure of Heart, though there are huge exceptions such as Fluttershy.

Note: Do NOT add heroes who oppose other heroes to this list. Save that for Good vs. Good.