Verlian Crowler is the head professor and department chair of techniques at duel academy. Initially started out as the antagonist of the show, Crowler wanted to expel Jaden from the academy, attempting several times. After losing the duel against Jaden, Crowler eventually had a change of heart, becoming more of a respectable teacher, as well as serving as a comedic relief.
Using the Ancient Gear archetype, which are mostly Machine-Type monsters, Crowler's playstyle revolves around trying to summon gear golem as soon as possible. This allows him to attack without without getting stopped by spell/trap cards, and difficult to go against since it also inflicts pierce damage.