Leon was killed by D before he settled in JapanIt would certainly explain why he ceased being mentioned, or appearing at the end of sidestories in Shin Pet Shop of Horrors. It would also give us a very grim reason for Leon not returning to America in order to be with Chris in twenty years.
D is the product of his father's research, just like Howell saidMakes more sense to have the family's only surviving ancestor split in two (Sofu and Dee), in order to handle the memories and emotions (anger, pain, fright) better. They could have the ability to be reborn upon dying (Dee did it), as well as longevity and eternal youth. This would account for all the other Counts that don't look like either of the current three, and would put Dee as the one Chris meets at the end of PSOH (respecting the most common Epileptic Trees on the issue). The D we all know and love, though, could only be Dee's creation when he learned enough about genetics and stuff; probably a backup plan for his eventual suicide when reborn as a human (Dee is long held, both in Fanon and Canon, to be insane; he could have been driven to insanity and death by the emotions of his "ancestor"). This experiment angered Sofu (the most likely host of the "ancestor's" memories, given that he knows the story the best), who took the new D with him in order to raise him... before he was complete, as his mysterious illness and eventual cure (that poor orangutan) seem to imply. For building D up, Dee could have taken part of his "father" (Sofu) and part of himself, therefore giving D his odd eyes. D is probably the most close in appearance to their "ancestor", if this holds true. Lastly, the terms ''father'' for Dee and ''grandfather'' for Sofu could be there only for formality. After all, Dee is the closest thing D has to a parent, and Sofu most probably wanted to rule over them both somehow (telling D all his life he was his grandfather, to inspire respect and authority... and probably discredit his "son" Dee).
The Pet Shop of Horrors universe is an alternate reality of a world with a superhero or superheroesTake a look at the setting: a major American city with lots of crazy and interesting crime. Take a look at the recurring cast: a Hot-Blooded cop, his pretty female partner, his cute little brother, Da Chief, and an enigmatic Stepford Smiler with a certain distaste for humanity and mad kung fu. Now think about it: in any other story with magic and serialized installments, wouldn't D be the villain, no ifs, ands or buts? Instead, the punishments he metes out are tolerated, if not exactly liked, by pretty much everyone but Leon, the one clean cop in town. Hm, now what does that sound like? Perhaps D's father makes a hobby of killing off capes (and considering how often human arrogance is amplified in supers, he almost certainly would want to); perhaps the prophets and mystics from whom the Ds are descended were meant to be the forerunners of the superhumans but ended up being forerunners of the Ds; or, as stated in the above title, perhaps this all takes place in a Wonderful Life universe. In 'real' continuity, The Hero is most likely Blue Oni to Leon's Red and has many Shut Up, Hannibal! moments when fighting D.
The Ds are Merovingians
'D' stands for DionysusJust take a gander at this.
The series is unoffical continuation of GremlinsObvious, isn't it? A mysterious shop in New York Chinatown, selling creatures that have strange, supernatural conditions attached to them, that will cause disaster when broken. Count D even speaks of his grandfather who supposedly owns the shop, who is undoubtedly none other than the Chinese man in Gremlins. Count D may be an ursuper rather than an actual grandchild though, and obviously has exactly the opposite philosophy concerning the shop's creatures to the original owner, who only wanted to keep them, and prevent them from falling into hands of people who couldn't hold the contracts - Count D on the other hand revels in chances to give his animals to such unsuspecting clients.
Mustafa was purchased from D's shop.Hence Kajika's haste in coming to the conclusion that Eugene is her pet leopard returned to life.
Shin Pet Shop of Horrors is actually a prequel to Pet Shop of Horrors.Thus why D has suddenly lost ten volumes' worth of character development. We just have it confused because of the side stories involving Leon. That's also why they stopped after two installments — the author realized that it was confusing people.
Count D is a Time Lord.You all knew this would come up eventually. As for his TARDIS, it's obviously the Pet Shop, which has been stated by almost all characters who have gone into the back rooms to be far bigger on the inside than it looks on the outside.
A Kirin is like a Western unicorn in that it does not anoint "kings" so much as it does the maidens who would eventually rule alongside the kings.D refused to sell the kirin to Kelly though he was the "king" the kirin ultimately chose. However, he instantly recognized Nancy as the Queen to whom the kirin should belong. Also, as mentioned off-handedly by D once in the series and expanded upon in Shin Pet Shop of Horrors, Hitler's Blondie was a kirin in disguise. In that case too, D's grandfather bowed to Eva Braun and gave her the kirin. In both cases, the kirin chose consort of the "kings" first.
Count D, and the rest of his people, are True Fae.Enigmatic, wield strange and terrifying power, and are inhumanly beautiful. The kingdom they hail from is Arcadia, and the pet shop's back door holds a portal to the Hedge - which is why the shop is so much Bigger on the Inside. The pets are really changelings, and the incense the Count sells with them is to ensure the Glamour doesn't wear off. In some cases, as with Alice the rabbit, they are children being sold back to their families after their fetch met some untimely end.
Count D's grandson will be killed by the Honlon sisters for harming a Human child in front of them.Two of the Honlon Sisters(Kanan and Junrei in specific) were created by Humans touching the Honlon egg plus the the sister created by Count D's grandson touching the egg(Shuko) was tearing up when Chris left while Count D's grandson couldn't care less and was probably relieved at the Human leaving. Since all three sisters are sympathetic to Humans(specificly Human children) the moment they see Count D's grandson try to outright kill a Human child in front of them they'll enter Unstoppable Rage and kill Count D's grandson and go for Count D/Q-chan himself considering he's the one who's indoctrinated both his son(mad scientist) and grandson(petshop caretaker).