Some people think the Dovahkiin is a Shezzarine but I personally think he's something new and unique.
The thing is, there's so much existing stuff to expand upon that a brand new thing is absurd.
BTW, in reference to the being "gifted by Akatosh" with the soul, as said by Argeir, I see this as the result of the Nords apparently adopting the Imperial Pantheon between the fall of the 3rd Empire and the game. Old nordic writings still refer to Kyne, for example, but the Greybeards talk about Kynareth. Shezzar is part of Akatosh, giving mannish aspects to Auri-El.