A lot of things. Being hurt and hurting others is what immediately comes to mind for Fred. He doesn’t have any phobias per se, but he can be a tad paranoid and jumpy a lot of the time. But he has the kind of mind that can take literally any situation and misconstrue it to an outcome involving physical harm on his end. The idea of authority and the law also make him scared since he sees them as things that are either going to hurt him or make him feel bad about himself. Ted is similar- anything that might hurt him. Large pokemon especially. His fears are far more immediate than Fred’s, not really imagining into the future, just getting scared when the situation calls for it. A more enduring, subtle fear of his, is that of never doing anything with himself and just fading into obscurity. He wants to leave his mark on the world somehow, and anything that gets in his way is on his hit list.