King Hugo is the king of Avantia. He resides in the palace in the capital city north of Errinel. It was King Hugo who sent Tom on his first Beast Quest. In the first book, he is distressed at Sir Caldor the Brave's death.

King Hugo once knew Tom's father, and when Tom asks him if they knew Taladon the Swift, King Hugo is reluctant to say anything, quickly dismissing the idea.