I don't think it's faunus specific but someone could end up that fucked up given the right circumstances. Only problem is when this eventually gets out, and it will eventually get out otherwise having it is completely useless as a story mechanic, I'm not really seeing anyway in which Beacon doesn't turn on Mokuren and she ends up in jail. Regular addiction that could make a good story element but I'm not really seeing anyone banding together to help her with her cannibilism problem. Plus I don't think it would exactly thrill Ozpin.