Actually, if your Warden was a Dwarf in DA:O and performed the Dark Ritual, Kieran is Half-Dwarf.
I'm not sure whether it was intended to compensate for this, but he's rather bulky, tall; for a ten year old.
As well, for Half-Elves, you've got Alistair, Feynriel, Michel de Chevin and Slim Couldry featured in the games.
If you want more detail about why they haven't done more with half-breeds, David Gaider has talked about it once:
http://forum.bioware...e-2#entry574687
Well, guess DA uses the a variation of the easy Tamriel-genetics to some degree: Offspring is always the same race as the mother...Bethesda obviouslyhad no interest in adding even MORE races to choose from, with all the possible combinations ^^ Clever girls at Bethesda...
There's still some ambiguity in the Elder Scroll franchise concerning this, as far as I'm aware.
Karliah, for instance, has purple eyes. Which goes to the debate of Nocturnal's influence, to Breton ancestry.
And there's a lot of muddied ground when it comes to the relation between the Akaviri and the Tsaesci.
On top of this, there's very little detail on Half-Beastfolk; unless ESO has shed some light on this.