User blog comment:Carebearheart/Inside Out antagonists/@comment-3438245-20140328032425

Strangely, all of the emotions are negative except Joy. There's probably a lot of dissension between the various emotions. But personally I wouldn't expect any of the emotions to be villainous per say. We have to live with all our emotions after all, so I would be surprised one of them becomes evil; plus, very few Pixar films have true villains (which is great!!).

But some emotions will certainly be antagonistic towards Joy (and Sadness?), which appears to be the main emotion character. Of what we currently know, it appears the group is divided between Joy and Sadness on one side and the three others on the other, so perhaps fighting will mainly be in that way.