SE Confirmed that mixed races exist.
All of the playable races have a common ancestor. (Stated at the Las Vegas Fanfest)
However, they are exceedingly rare and we do not know what they would look like.
--
As far as interbreeding between different clans of a given race, it happens. Chances are, there would be mixed physical traits from each. (Maybe the Keeper fangs and the Seeker eyes?)
As far as cross-clan miqo'te go, the naming conventions actually talk about it directly.
http://finalfantasy.wikia.com/wiki/Miqo%27te/Naming
All of the playable races have a common ancestor. (Stated at the Las Vegas Fanfest)
However, they are exceedingly rare and we do not know what they would look like.
--
As far as interbreeding between different clans of a given race, it happens. Chances are, there would be mixed physical traits from each. (Maybe the Keeper fangs and the Seeker eyes?)
As far as cross-clan miqo'te go, the naming conventions actually talk about it directly.
http://finalfantasy.wikia.com/wiki/Miqo%27te/Naming
