Board Thread:Roleplaying/@comment-24339224-20150816215930/@comment-6881629-20150817090107

Bretons may have first been breed from Man and Mer in a Altmer experiment, in some of the older artwork they even looked a bit elvish. As far as we know (from the book Notes on Racial Phylogeny) a male Mer and a female Nord would produce a Nord as a childs racial traits are generally from the mother, and being Dragonborn is a gift from Akatosh.

For the most canon friendly character i would say use the Last Dragonborn seen in the promotional art (it is pretty much the default male Nord).