Mute

Marth is someone who thinks that if he is mute, the whole world can run smoothly and not have any flaws along the way. When he does talk however, the pristine and proper prince he is presented as is ruined and now shows an ill-mannered, uneducated, and definitely ignorant human being. Samus is the only one who can ever calm Marth down, and she hopes to change him back.