Theo, the Duke of Tintagel, is portrayed as a charming, intelligent, and initially seemingly kind character. Theo also displays impulsiveness, insecurity, and a tendency to idealize those he is attracted to. He can be emotionally reactive. While he initially appears to be a supportive figure, his actions and reactions sometimes reveal a possessiveness and a desire for control. He has an artistic side, which is seen in his painting. He also displays sensitivity and empathy. 