The dwarven princess doesn't count because her father doesn't die until half-way through the game, and I'm discussing Wardens who started out orphans.

Then there's the human noble, Cousland, whose parents die during the origin.

The entire theme of her story is that she makes a new family with Irving and Jowan.

There's the elven mage, Surana, who doesn't know where her family is.

That's a surprisingly low number considering that most RPGs begin with the burning of the protagonist's homeland and/or the slaughter of their family.

Only three of the Wardens begin the game with dead parents. Because of this, the Warden becomes a sort of mentor to her. Also, one of your followers is Velanna, a Dalish elf on a redemption arc similar to Mahariel's. It makes no sense to try and assassinate the human noble Warden, but a Dalish elf (or any other origin, for that matter) ruling humans? That's something that would ruffle some feathers. Awakening makes the most sense as a Dalish elf because the nobles try to assassinate you when you're made arl over the arling (if I recall correctly).

Has the most interesting Awakening playthrough as well.

As if to make up for the lack of content in the main game, the Dalish Warden returns to the ruins where their story began, they get a Dalish follower, and they learn more about Dalish lore, making them the most relevant Warden for the DLC.

Gets a lot of content in the DLC Witch Hunt.

Three prominent Dalish stood up to protect the world, proving that the Dalish aren't as terrible as some think and that nothing is black and white (which fits the franchise theme of 'gray morality').

Could be seen as having a tie to both Ameridan and Dalish Elf Inquisitor.

Actually does have ties to everything in the game with the exception of Orzammar: the Dalish Warden would have an opinion on the mage/templar conflict because of her people's struggles with magic (in Origins you discover during Wynne's personal quest that her apprentice is living free as a Dalish) the Dalish Warden has special dialogue in the alienage and the Dalish Warden would care who sits on the Fereldan throne, since it would directly impact her people (if Anora is chosen without Alistair, she is pretty hard on the elves).

Ties the three games together with the inclusion of Merrill, more eluvians, more elven lore, Flemeth's fondness for the Dalish (expressed in Inquisition), and Solas the Dalish-hating ass being an antagonist.

Is the origin that introduces eluvians, which wind up being important later.

This is pretty funny to me, since the Dailsh Warden wound up becoming so symbolically integral to the overall story three games later ('symbolic' because it doesn't really matter choice-wise if she was the Warden, but having her as Warden makes the world more interesting). But David Gaider wrote such an interesting (in my opinion) origin for the Dalish Warden that it was added at the last minute.

Dragon age origins elf