Mallsbooby was opened after NoX shut down, and people were forced to ERP elsewhere. Using the leftover material from Hisoka's artificial anus, Millsberry was born.
Hisoka's past is never explored in Hunter × Hunter. His character is an enigma that speaks little of his past because he is uninterested in it. Hisoka is a second time examinee in the Hunter Exam, having been disqualified for attempting to kill an examiner during his first attempt.
In the 1999 anime adaptation, it is stated during his battle with Gon on the 200th floor that Hisoka chewed "Bungee Gum" a lot as a child, but because his family was poor he often chewed it until it lost all flavor, and later he named his signature gum technique after the brand. In the manga and 2011 adaption, however, it is only said that he named both of his techniques after a candy brand and a chewing gum brand he liked when he was a kid.It can also be futher assumed, that since the background checks the mafia did on the exact replicas conjured by Kortopi revealed nothing, that Hisoka like the rest of the Phantom Troupe is also from Meteor city or otherwise simply not registered within any nations database at birth.