William, also known as will, is the husband of Princess Monica, and king of their kingdoms. William is shown to be quite careless and jocular throughout the series, though Damien states he likes to play dumb. In fact, under his joyous attitude he's shown to be highly observant and deeply secretive. As the future heir of his own kingdom as well as Monica's (thought engagement), he was trained how to reign since young age. For this reason he puts his royal duties over everything, even his own wishes. He knows he is not strong as his friends, but he hates being useless. For that reason he often makes reckless and bold decisions, putting himself in danger, especially when the people he cares the most are in trouble.