Hmm...that seems as though it might work! Just have all normal characters have normal blood, and for people like Reptile, a Cyborg, etc., just have some code like that pointing to a specific blood color for specific characters by specific people.
You have to DL the right SP, and put its Fight.def in the System.def. It would replace the normal sparks for anyone without pre-equipped sparks. And yes, the blood works! (Even though you say it doesn't...)
I think that this Rock needs a better Select Portrait, because small childish head and nothing else is small, childish, and nothing else. Also, when will someone edit a Rock to become Leo from Tekken? Not only would that be a different fighting style, but for some reason, a gender bender as well. Yeah, Leo is a chick.