Vellian Crowler Vellian Crowler , known in Japan as Cronos de Medici ; sometimes spelled Chronos de Medici , is the head professor and department chair of techniques at Duel Academy . Initially scheming and underhanded in attempting to expel Jaden Yuki , Crowler grows throughout the series to appreciate all his students and in turn be respected for his noble actions . He was the main antagonist of the first half of the first season before the Shadow Riders debuted . Design . Appearance . Crowler ' s character design was overseen by Kenichi Hara . His usual outfit consists of the a more regal variation on the standard Obelisk Blue uniform , complete with gold trimmings and ruffled pink collar , shoulders , upper chest , and sleeves . His blonde hair is sectioned in two layers , with the layer furthest from his face tightly - bound in a ponytail , and he also wears crescent - shaped earrings . He carries an Academy - issued Duel Disk known as a " Duel vest , " worn horizontally across his torso , which has a motion sensor that automatically ejects cards from his Deck when he is ready to draw . Voice and mannerisms . In the dub , Crowler has a vague British accent , though he still has an appreciation for Italian culture . His original counterpart speaks with a thick , almost stereotypical Italian accent , often yelling such phrases as " Mamma mia ! " and " Buongiorno , " ( even once saying " pramazan cheese " ) and ending the majority of his sentences with " ( na ) no ne " ( " is it not so ? " ) . He uses the personal pronoun " " watakushi " " . He has the tendency to talk to himself allow while walking . Crowler ' s clothing and hair have led many to call him " Miss " in the dub ( though Jaden first thought Crowler was some kind of " academy mascot " when they first met , annoying Crowler as Jaden laughed ) . Whenever someone tries to figure out Crowler ' s gender , he gets angry and prefers to be called " Doctor , " claiming to have a " Ph . D in dueling " . He dislikes Lyman Banner ' s cat , Pharaoh , as he hates cats . He is much more respected by his students ( including Jaden ) in the Japanese version . He calls Slifer students , Jaden in particular , " Slifer Slackers " in the dub , while in the original , Cronos calls Osiris students " Dropout boys " . Despite this he is capable of being a fair person which is shown when he passes Chumley for excellent dueling even though he lost . Etymology . His name in the Japanese version is derived from the names of , the personification of time in Greek mythology , and the , an Italian noble family who ruled Florence and Tuscany during the Renaissance period . Biography . Vellian Crowler is a professor of the Obelisk Blue dormitory at Duel Academy . His main goal in the first year is to force low - performing students out of the school . After Jaden Yuki defeats him in a Duel , he tries as hard as he can to get Jaden kicked out of the Duel Academy , but fails miserably . Notable schemes include making Chazz Princeton Duel Jaden with " unbeatable combos , " and placing a fake love letter in Syrus Truesdale ' s locker ( which he mistook for Jaden ' s ) to catch him peeping in the girl ' s bathing facility . Other schemes include Crowler hiring a hit - man named Titan to frighten Jaden and his friends out of Duel Academy , hiring the Paradox Brothers to Duel Jaden and Syrus in a tag - team Duel in hopes they will be defeated and get expelled , having Jaden go out after hours to Duel against the " Duel Giant " ( knowing Jaden can be expelled if he ' s caught ) , and getting Belowski to Duel Jaden to convince him to run out . Crowler is chosen as one of the seven people that guard the Spirit Keys from the Shadow Riders in an attempt to prevent the resurrection of the Sacred Beast s . He Duels the second of the Shadow Riders , Camula , but is ultimately defeated and turned in to a doll . He is restored when Jaden defeats Camula . At the end of the first year , he Duels Chumley Huffington , with him agreeing to offer his recommendation to Industrial Illusions should Chumley defeat him . Though Crowler wins the Duel , he allows Chumley to pursue his dream of becoming a card designer due to his vast improvement in practical Dueling . During the second year , while Chancellor Sheppard is away , Crowler takes over his position at Duel Academy alongside Vice - Chancellor Jean - Louis Bonaparte . For much of the season , the two devise schemes to market Duel Academy , but often argue over what methods should be employed to do so . Bonaparte resorts commonly to attacks , physical or otherwise , on Slifer Red , which he sees as a stain on the school ' s image , prompting Crowler to step in and defend the dorm on multiple occasions . In the Japanese version , Bonaparte addresses Crowler as a " temporary principal " to insult his feigning position . After Sheppard returns to his duties , Crowler and Bonaparte , thinking themselves to be fired on account of one of the Chancellor ' s angry outbursts over their bickering , attempt to find new jobs with Industrial Illusions . Maximillion Pegasus agrees to open discussions on the matter , provided they can defeat him in a triangle Duel . Although they lose to Pegasus , Sheppard states that it was all a big misunderstanding , and that they were never fired in the first place . By the third year , Crowler has grown to respect Jaden a bit and even comments that " Jaden usually saves them " when things go wrong . Crowler becomes another zombified victim in the different dimension along with Axel Brodie ' s entire " Blue Berets " group that he had used to combat the Duel Ghoul s . However , he does not Duel when Jaden and his friends return to the different dimension to find Jesse Anderson . Because he did not Duel and was not sent to another alternate dimension , Crowler was present to watch Jaden ' s Duel against Yubel , who was possessing Jesse , along with Syrus and Ojama Yellow . Crowler ascends to the position of vice - principal of Duel Academy in the fourth season after Bonaparte quits . Along with being a professor and vice - principal , Crowler is also revealed to be a career adviser . As Jaden ' s graduation nears , he reverts to the cruel and bitter personality he had in the first year , making his students do math problems and even having them spend entire classes doing pushups . When he wouldn ' t show up to his lessons , the students chased him around to school to know why he acted so odd . He revealed to them that he didn ' t want any of them to leave , and thus wanted them to not take enough classes to graduate . Jaden Duels him , and Crowler fights back brilliantly ( even pushing Jaden into a corner multiple times ) but is defeated by Jaden in the same manner he did during the entrance exams ( causing Crowler to joke that using " Elemental Hero Flame Wingman " in conjunction with " Skyscraper " is the only strategy Jaden knows ) . This act restores Crowler to his usual self , leading him to make Jaden make up for all the classes he had missed recently . It is assumed that Crowler , along with everyone else , was pulled into the world of Darkness during the Trueman siege and brought back when Jaden defeated Nightshroud . He was last seen trying to make a speech to the third - years , but broke down and cried violently before being carried out by the other staff members . Afterward , he attended the graduation party with his students . Other appearances . In the " Yu - Gi - Oh ! GX " manga , Crowler performs in the same manner he did in the first season of the anime , although he never Duels . Deck . Crowler uses an " Ancient Gear " Deck , mainly focusing his tactics on summoning his signature " Ancient Gear Golem " cards as fast as possible through methods such as " The Trojan Horse " and a combination of " Statue of the Wicked " and " Heavy Storm " .