Quote Originally Posted by Raminax View Post
Keyword being motif. Meant to invoke the imagery of demons, rather than being descended from them.
It's actually rather heavily implied that au ra are descended from voidsent and hyurian ancestors. The Domans treat Yugiri as a Lady not just because she is a powerful Ninja and leader in her own right, but likely also because the Au Ra live as Oni often do in Japanese folklore, so one that chooses to descend from their misty mountains is a rare treat for the "lowly mortals" of Doma. In addition to this, the Dawn Father and Dusk Mother, assuming that the Raen and Xaela truly do share their characteristics with their origin mythos parents, are likely a hyur or group of hyur that summoned a female voidsent (likely a succubus) or group of voidsent and produced fertile children with them. The fertile children, being neither purely of Hydaelyn or of the Void, likely ended up adapting over the years to Hydaelyn and also likely further diluted their blood by interbreeding with Domans until we got the au ra of today which are closer to hyur than any voidsent we've seen except for succubi, which as we know are often spoken possessed by a succubus-type voidsent.

As for the main topic: No, auri tongues are the same as hyurian tongues which are the same as human tongues.