If you want to backpack sounds, costumes, characters, look inside and go to the sprite called "Stuff for Backpacking" and everything's in there. Some things are just harder to put into a costume of it's own, so I did it for you. :D
FINISHED! Unless... You want me to add SKINS next? Fine... I'll work on it. There will be a button to switch the skins of the Killer to play the special Chase Theme music and if you want, I'll make the backgrounds change too. If not, well, it will be the same. But instead of a Random button, will be the Killer Skins button.