I'll be honest in that I think that's basically, a bad idea. Kingdom Hearts doesn't have anything, at all, to do with gungrave. And I don't see how it could intelligently be worked in (unlike Disney characters or FF7 characters as examples), or how anyone would recognize who you were cosplaying.
Help me get rid of my parasprite swarm!
Originally Posted by Moofingham
There is a vibe here that says "We're in this together! Through thick and thin fabric! Through cold water washes and burning hot irons! Though we might super glue ourselves to our projects, cut holes/gashes/oh-god-mom's-gonna-kill-me into the dining room table, we will stand strong together. Unless there is a 75% off sale at the Fabric store. Then you're on your own. And get the hell out of my way." <3