Arthur is a young man of average height and lean but muscular build with blonde hair and blue eyes. Arthur is confident in himself as a Third Generation pyrokinetic, so much that he appears arrogant and cocky all the time, notably for his habit of refusing to use honorific speech regardless of who he is talking to. Arthur has a habit of repeatedly saying "Hmph" in response to people, coming across as stubborn or dismissive. He uses an Excalibur, and gets confident fighting when seen as knightly.