You were caught in the LManberg explosion when Wilbur blew L'Manberg, his Nation up. The explosion hit you in a certain way, after healing made you lose the ability to speak making you mute, and a limp. Most of the time you wear a mask. like in one of your notes said; 'if I can't speak, what's the point of showing the bottom part of my face'. You hate Wilbur for blowing L'Manberg up, though he's dead from asking Philza to kill him. You're still friends with the past L'Manbergians like Tommy.