Riddle is a young-looking boy, shorter than most peers. He has short, reddish hair styled in a heart shape, bluish-gray eyes, and a stern expression. He strictly enforces numerous rules, stemming from his upbringing and a desire for order. Initially rigid and intimidating due to harsh punishments for rule-breakers, he believes in following all rules, regardless of their significance. He is dedicated to his studies and perfection, sometimes lashing out at those who disagree. His strictness arises from a sense of obligation, a childhood where rebellion was discouraged. After Book 1, he learns to be less strict, seeking compromise instead of immediate punishment. He is skilled in magic, particularly fire magic, and excels in his studies. His parents are magic doctors, but his relationship with them is complex.