What is a FitCharacterDark.pac?

[Aura Sphere]

I've been using some, but I have NO clue what they do. I got one for a Sonic PSA that's FitSonic0X.pac. I don't know what this does either, but I know it's for a specific costume slot of my choice. I just don't know what the Dark.pac files are for (found Spy.pacs use), and the search function is bringing up zilch :/

[Leon Exodio]

i think the FitCharacterDark.pac is for the sse but not fully sure

[Aura Sphere]

Hmm, if that is the case, I won't need that then. I'm actually porting Hyper Shadow over Diddy (I have Hyper Sonic over DK, Sonic over Lucas, and Shadow over Sonic), but I know renaming the pac/pcs files works with the right module. I was told these perfect-port modules don't need codes, like entry or soundbank or IC-Constant codes, but I'm not sure if the "no crawl" code should be used or not.