Ryogo Matsumaru (松丸亮吾) is the president of RIDDLER Corporation, creator of riddles. After entering the University of Tokyo, Ryogo Matsumaru became the head of a riddle-solving production circle, and has since become a "riddle-solver" who has created a huge boom in various fields. His book series has sold over 1.55 million copies. He is also the author of many other books.

Role	Media	Title
Voice Actor Indigo Academy Student	PM2023 91	To the Skies Once More, Part 2   大空へ向かって、再び　後編   Eyes to the Skies Once Again, Part 2