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All demons in Buffy are part human, and therefore capable of interbreeding. So what happens when they do?

For instance, would the child of a bracken demon and a polgara have face spikes and big arm spikes? How are supernatural traits inherited?

Are there any instances in the show (or Angel) where two demon species reproduce?

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    I'm willing to agree that all (most) demons are humanoid, but that doesn't necessarily mean they're "part human." Lorne's species, for example, comes from a parallel dimension, despite looking like humans with green skin. Interbreeding might be possible between some species (one or two species do it on screen), but what evidence do we have that all or even most can do so? – Steve-O Mar 23 '17 at 14:32
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    Just as an aside Brachen demons do not have retractable face spikes Doyle had a human form and a demon form his spike were always present in his demon form they only gave the appearance of being retractable because he could switch forms at will – revenant Mar 23 '17 at 20:59
  • @revenant good point, edited – Benubird Mar 24 '17 at 16:41
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    @Steve-O it's actually canon that all of the "demon" species are part human - the result of the Old Ones breeding with humans before they were banished. – Benubird Mar 24 '17 at 16:42
  • @Benubird Good find. I didn't recall that detail myself. – Steve-O Mar 24 '17 at 18:01
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Not all demons were part human only demons native to our dimension I am not entirely certain if there is a canonical list of which demons were native though.

Not all demons were capable of hybridization with humans, most instances of demonic reproduction we see someone or something is about to die a horrible horrible death when a fully demon creature rips its way from their body, or they were going to be eaten after being used to fertilize eggs.

It is likely that different species of demons cannot hybridize even if they both have human blood does not mean their demon blood would mix as far as I know there are no demon/demon hybrids depicted in either show

EDIT: Each half demon we see is a somewhat unique individual so we have no way to compare how their demonic traits are normally passed it is also important to note in the real world hybrid expression can change depending on the gestating species. A quote from the buffy wiki "A half-demon would be something entirely new in each case" is probably the closest one could get to an answer.

  • Yes, but I'm only asking about the ones that can interbreed. We see examples in the show of part-human demons, and if two species can hybridize with humans, then they can with each other. – Benubird Mar 24 '17 at 16:47
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    With real world genetics that would stand but with supernatural genetics it is not necessarily true. It is also important to note that DNA transfer may not play any role in half-breeds Cordelia was made into a half demon through some form of essence bonding or transfer. There really is no way to answer the question in canon. – revenant Mar 25 '17 at 6:14
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    Note that the slayer line was also created by bonding with a demon, but Buffy is never referred to as a demon or half-demon herself. Maybe it's a semantic thing, just calling cordelia "half-demon" because "human partially possessed by bonding with a demonic spirit capable of transferring supernatural attributes" was a bit long for everyday conversation... :p – Benubird Mar 28 '17 at 12:50

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