* {{Catgirl}}s and other CuteMonsterGirl {{Half Human Hybrid}}s. Sometimes treated the same as humans, sometimes treated differently, sometimes they ''are'' a form of normal humans (such as ''{{Manga/Loveless}}''), and so on.
* This is a serious concern that scientists and politicians have been mulling over in RealLife for decades now:
** There's a specially designed test called "[[http://en.wikipedia.org/wiki/Turing_test the Turing Test]]", which is meant to find if an artificial intelligence is genuinely sentient. So far no robots or computers have been able to pass it, and it's usefulness is a major point of contention for scientists (not helped by the fact that some ''humans'' somehow manage to fail the test). However quite a few are sure that, eventually, there ''will'' be a machine that will pass the test.
** [[http://en.wikipedia.org/wiki/Ethics_of_artificial_intelligence The ethics and rights of robots]] have been debated about for ''ages''. Currently the argument seems to be less whether robots should have rights and more ''which'' rights robots should have and when.
** [[http://www.rfreitas.com/Astro/LegalRightsOfETs.htm This article]] discusses and explains in detail how governments are preparing in case of contact with sentient aliens and whether they would be treated as legal citizens. It seems that in the current state of such laws, there's a metric assload of bureaucratic snafus and loopholes that would have to be dealt with for aliens to have any real rights while on Earth. It's most likely that if we actually did meet aliens, there would be some hasty reworking of laws and a new legal classification created so as to avoid FirstContact becoming a political shitstorm.
** For some inexplicable reason, updated rules mean that [[http://www.tor.com/blogs/2014/09/copyright-law-supernatural-beings-monkey-selfie supernatural creatures cannot hold legal copyrights in the US]], regardless of their level of sentience. If Dracula were real, he'd be screwed out of royalties to his own name.