The D The D , known in Japan as DD , was Aster Phoenix ' s legal guardian and the reigning champion of the Pro League for ten years . Etymology . In the dub , the name The D uses as Aster Phoenix ' s guardian is Kyle Jables . This is an allusion to the comedy band who sometimes call themselves The D . It ' s a pun of the band member ' s names , the band and their names " Kyle " Gass and Jack Black AKA " Jables " , which can further be suggested with the fact that his key card ' s Japanese name end with a D , being named Bloo D , much like the band , as well as being the band member ' s defining trait . His name in the Japanese version stands for " Destiny Duelist " . Biography . Sadistic and intelligent , The D serves as Aster ' s lifelong enemy due to the crimes he has to done to Aster ' s father . Although his actual appearance is short , through him , Aster was able to find out about The Light of Destruction and the cause for Sartorius ' change in behavior . When the D ' s normal personality is in control , his hair is smoothed back and he has an almost permanent worried expression on his face , however when his split personality takes over , his hair becomes wilder and spiky , his eyes narrow evilly and he has a sadistic evil grin . When The Light of Destruction completely takes over , his eyes glow red , as seen when he Duels Doctor Collector . After learning about " Destiny Hero - Plasma " from Aster , who came to retrieve the card design after it was blown away by the wind , The D broke into Aster ' s family ' s apartment to steal the card . However , upon being interrupted by Aster ' s father , the D intrigued the interest of The Light of Destruction possessing the card , causing him to developed a sadistic and uncaring split personality bent on destruction . Thus enabled , he murdered Aster ' s father in cold blood ( kidnapped in the dub , although he strongly alludes to killing him ) and took the card for himself . After the theft , The D became Aster ' s legal guardian in hopes of avoiding detection . He later becomes the Pro League Champion and holds his title for 10 years . In unofficial underground Duels , however , he has taken the souls of countless Duelist s with " Plasma " . The D then Duels Doctor Collectors in order to retain his title where he defeats Collector with " Plasma " , setting the arena ablaze and subsequently doing away with Collector . He is then confronted by Aster , who is in total shock when he shamelessly confesses to his crimes . Although he uses " Plasma " , it is trumped when Aster uses " Destiny Hero - Dark Angel " , who was designed to counter " Plasma " . After being defeated , The D gets caught in the explosion resulting from the card ' s purification . He swears to " return one day " before being engulfed in the flames , although his death is apparent in the Japanese version . Deck . The D plays a Destiny Hero - Plasma Deck , which focuses on the Summoning of " Plasma " , which he stole from Aster ' s father . He also uses many support cards for " Plasma " , including its primary supplementary card , " D - Force " , which makes it immune to Spell Card s , Trap Card s , and the effects of Monster Card s .