Fury in the Codex?

[kurikara-ryuoh.livejournal.com]

My first question is a nice light topic: What are the connection to furies and humans?

So furies are element creatures as with the windmanes and the mountain that doesn't like people, both mention in Bk1. However, if they are independent beings, why do the Marat not acknowledge them? Why do they only bond to humans and how does this bond work?
The Marat bond is a blood transfer, maybe like a DNA mapping or exchanging since she does get green eyes. Alerans have bonding with a fury. Both happen after a a certain age, so they aren't born with the talent, the mutation. It is a bit like mutants from x-men with their needing to "grow into" their furies. [I can't remember who says that or when.]

And what's with having more than one?!