The player tarnished is godwyn. Godwyns soul in a new body.
Let's list some things shall we
>the tarnished wakes up next to a walking mosoleum
>these mosoleums house the bodies of marikas children who lack souls and were killed during the night of black knives by r*nni
>due to the lore of the mosoleum knights we know at least ONE of these demigods were reborn recieving a new soul. But their mosoleum is never shown nor are they hinted at
>we know based on the base game and dlc a soul can find a new body, either by force or in its own. The soul itself needs to be killed
>godwyns soul was indeed killed and should have gone somewhere. But where?
>miquella tried many things to kill godwyns body and even with the rune of death being released his body is still unkillable. Why? His soul is still around.
>our character can tank the power of the rune of death capable of dying by it and still being able to resurrect despite the game telling us it could permakill through grace. Only beings affected by it before could tank it.
>this is why torrent chose you
>this is why morgott suspects something is off about you
>this is why you are seemingly of no renown but are still made differently than other tarnished
And the most damning evidence?
In a pre dlc release interview miyazaki brought up the idea of godwyns soul finding new life and not in "the player"

Whether you interpret this statement in a meta sense or an in lore sense. You are godwyn.