George is suffering from an obsessive-compulsive disorder. if he tries to stop his compulsive behaviors, he is likely to experience

Obsessive-compulsive disorder is an anxiety disorder in which an individual have persistent unwanted thoughts or obsessions that gives them the urge to do something repeatedly. People with obsessive-compulsive disorder find it difficult to stop the compulsive acts or to keep their focus off the obsessions and an attempt to stop it can lead to depression and severe anxiety. For the question given above, George is likely to experience severe anxiety if he tries to stop his compulsive behaviors.

fumikage isn't really a bird, and tsuyu does have teeth. tsuyu has a transformation quirk which still allows her to be partially human. otherwise we'd have a large frog running around. fumikage has teeth because again, he isn't a bird. his head was a quirk mixture if i'm correct.