jamoecw--Back in Issue #3, Fracture said, "At another time, I would have called myself Fission . . ." (http://fusion.webcomic.ws/comics/59/). Like Bob said (also in Issue #3; http://fusion.webcomic.ws/comics/67/), Fracture's the yin to Bob's yang (man, that sounds dirty).
So your thinking is right. After all, what gives dirt a reddish color (and is likewise present in desert sand)?
ya, all signs point to fission, however there is always room for doubt until it is expressly stated.
and yin is feminine, yang is masculine. that is why it sounds dirty, because the dirty 'yang' term is directly derived from the masculine/feminine meaning (and ends up matching bob and her situation).