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Matsudo (松戸 まつど Matsudo), full name Matsudo Kyōsuke (松戸京介 まつど きょうすけ Matsudo Kyōsuke) is a student of Reihō Academy and the president of the academy's science club in the Kunio-kun franchise. His debut game was in Downtown Special: Kunio-kun no Jidaigeki da yo Zen'in Shūgō! as one of the game's bosses, Nizaemon.
Matsudo is also one of the possible leaders of the final boss team in River City Melee: Battle Royal Special.