We have never had "Allies" and "Enemies" categories. Making those categories wouldn't show a reader "who knows who" anyway. You are welcome to start a community discussion, if you want, but an "antagonist page" most likely isn't going to be approved by the community anyway, as the term "antagonist" is subjective and we've already removed the villians category for that reason.
I meant the Allies and Enemies on the character pages, you know like: Anna::Allies-Kristoff, Enemies-Hans. I just think it is nice to have direction with the characters in terms of who hates each other