If it looks like a kid, even a kid with fairy wings, then many people will consider it a kid and you're skirting some dangerous laws, not to mention a lot of popular opinion.  Tacking some trivial detail on and saying "but it has fox ears, obviously not human!" does not matter all that much. 

Quote - Appearance or portrayal alone isn't good enough for the authorities to prosecute.

You're mistaken.  Not only are people in prison for breaking the law I mentioned earlier, the first guy convicted under it already had his appeal get crushed:
http://findarticles.com/p/articles/mi_qn4183/is_20090105/ai_n31173798

Next batter up is Christopher Handley:
http://www.iasd.uscourts.gov/iasd/opinions.nsf/55fa4cbb8063b06c862568620076059d/20a96a77c04347ed86257480006ae8c5/$FILE/Handley.pdf

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