Prince William, also known as Will, is the fiancé of Princess Monica.
William is shown to be quite careless and dim-minded throughout the series. Though his heart resides in the same place—to protect. William can be dull, as he always thinks about playing the role of hero and nothing else. However, despite that, he is shown to have characteristics of jocularity and justness. Prior to his impulsive state, William is reckless, though he is shown to be highly observant and lightly secretive under his joyous attitude.