Multiplicity

It depends on what you're defining as normal, but it certainly does seem to be pretty common around here. :3 Though, I think a lot of people hide it in more 'standard' multiple communities than this one, because they worry about what people will think. (And to be fair, I see why people worry, because I've seen some pretty... gross outsider misinterpretations of non-human or partly-human system members before.)