Belowski, known in Japan as Mokeo Motegi (茂木もけ夫, Motegi Mokeo) is an Obelisk Blue student and the former top student of Duel Academy who has the power to communicate with Duel Monsters. Belowski is a laid-back, carefree, peace-loving boy who isn't afraid to take a nap at the most precarious of times.
Those in his presence gradually fall asleep without proper precautions and therefore he is confined to his own personal dorm, "a secluded paradise within the depths of the school" as Dr. Crowler calls it.
Because of his unusual talent in making those around him woozy, Crowler sets up a duel between Belowski and Jaden Yuki in the hope that Belowski's power might affect Jaden long enough for him to lose the duel, thus expelling him from the academy. However, Jaden's excitement and passion for dueling overwhelms Belowski's power and he ends up winning anyway, in which Belowski promptly dozes off after their duel.
Belowski returns during the second year as one of the few Obelisk Blue students left untouched by the Society of Light and participates in a Duel of the Genex Tournament against professional duelist Elroy Prescot, who becomes so tired from the boy's special ability that he forfeits the match. He is last seen rejecting Crowler and Vice-Chancellor Bonaparte's offer to become a representative of the school and choosing to take a nap under the shady trees instead.
His character in the dub, as well as the title of his debut episode, are based on the film, The Big Lebowski. He speaks like a 1970's rebelling hippy, using terms such as "The Man" and "The Establishment". His Japanese given name is a pun off the name of his key card, "Mokey Mokey".
Belowski had originally played a different type of Deck, before strange things began to occur to his opponents. Although only two monsters were shown, it can be assumed that he played a Dragon Deck since both of them were Dragon-Type monsters.