I personally also think it's highly unlikely that Nakaba and Loki are blood-related, but - in theory at least - not
necessarily impossible.
As a matter of fact it mostly depends on whether or not can kids be born from human&ajin relationships, but unfortunately, and if my memory serves me right, the manga hasn't touched upon that subject yet. And as for Nakaba having ajin blood within her if she and Loki are half-siblings, well that's not exactly correct either. After all if you are half-siblings with somebody, than that means you only share one parent with the person, and not both. And if neither the parent they share, nor the one she does not share with Loki is an ajin - and I think it has been pretty much confirmed that both of Nakaba's parents were humans -, than that means Nakaba doesn't have a drop of ajin blood within her.
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