Deron is a character appearing in the Tag Force series.
In Yu-Gi-Oh! GX Tag Force, Deron is a Ra Yellow student who can usually be found outside the Obelisk Blue girls dorm. Upon being defeated he suggests the player bring a cute girl to duel with him next time.
In Yu-Gi-Oh! GX Tag Force, Deron plays a Deck called Deron Special, which is filled with various female monsters, particularly the Charmer series and other Spellcaster-types such as "White Magician Pikeru" and "Ebon Magician Curran".
Tag Force - Deron Special