Thanks to Dantarion's OpenSA, I discovered a useful variable in Fighter.pac!
IC-Basic[2] is your damage %. Don't get too excited -- if you add or subtract from it, the game crashes. You can, however, use it to have certain things happen based on your current percentage.
For example, I used it to make a kill-able Giga Bowser, which I'm going to post in the Character Submission thread momentarily.
That said, if anyone has a set of codes that makes Giga Bowser reliably accessible as a character, free of crashes, please give it to me.