Bear with me on all this. I know it's a lot to read, but give these theories some valid thought...
As a werewolf, you would go to Hircine's Hunting Grounds, unless (Spoiler) you cure yourself of your Lycanthropy, freeing yourself from either a wondrous or horrible fate (depending on your preferences).
As a Nightingale, you would be forced to serve Nocturnal in the Evergloam until she feels your service is sufficient enough to free your soul to wander the shadows, watching over your fellow thieves for all eternity.
As Listener for the Dark Brotherhood, you are bound to the Void upon death, and as such much serve Sithis for all time.
As a Vampire (either normal or Volkihar), it is possible (unconfirmed and by no means certain) that you are bound to the service of Molag Bal in his realm Coldharbour, as he is the Father of all Vampires.
As a Nord (my personal choice because the game takes place in Skyrim), due to your numerous deeds and accomplishments in
Elder Scrolls V: Skyrim, you have the chance to go to Sovngarde, though other loyalties/debts incurred may prevent this.
As a Dragonborn, you are the chosen champion of the primary god of the Eight and One Divines, and due to your abilites and feats may very well be the reincarnation of Hjalti Early-Beard/Tiber Septim/Talos of Atmora/Talos Stormcrown/Ysmir (Dragon of the North, a title you are granted for your status as Dovahkiin, and likely one given to all Dragonborn who undergo training in the Way of the Voice by the Greybeards); thus, you may very well follow in the footsteps of your previous life and/or predecessor.
As Alduin's Bane, you may ascend to Divinity for your superhuman feat.
As the Last Dragonborn, you may be considered exempt from all above paths simply due to your absolutely unique status in not only Nirn, but in the history of Mundus (the First Dragonborn was probably Alessia, and became a Saint; you're the last, so you may earn a similar honorific, if not better).
Due to the abundance of souls absorbed during your campaigns throughout Skyrim, it is possible that these may be used to "pay the debts" you owe, as stated by a previous theory in this post, though it is highly unlikely.
But, and this is my favorite, you may actually end up having ALL OF THESE occur to you, for one simple reason: you are a living, breathing Dragon Break. You not only temporarily broke the Dragonborn Prophecy (Alduin was supposed to destroy all life and end time, but you
delayed him), but you also travelled
back in time (with the use of the Dragon Elder Scroll in the quest
Alduin's Bane), causing one break in the space-time continuum, but you also travelled to the plane of Aetherius when you reached Sovngarde, which, if you remember from Elder Scrolls II: Daggerfall, travelling to Aetherius caused a Dragon Break then as well (when attempting to recover the Mantella), known as the Warp of the West or the Miracle of Peace. Since Dragon Breaks pretty much make everything that happens in their relative timeframe fairly screwed up, it's also possible that:
1) Both the Empire and the Stormcloaks won and/or loss the civil war in Skyrim.
2) The Volkihar Vampires and the Dawnguard were both victorious and/or destroyed in the culmination Tyranny of the Sun Prophecy.
3) All faction quests did and didn't occur.
4) The Dragonborn ascends, is forced into servitude by Nocturnal, is consigned to Hircine's Hunting Grounds, inhabits Sovngarde alongside other Nord honorable dead (if a Nord), is made a Saint (if Jiub is a Saint, then the Bane of the World-Eater should be one!), is forced to serve Sithis in the Void for eternity, and all the other proposed death scenarios, while at the same time remaining on the physical plane as a mortal/immortal warrior of godlike power and acclaim (much in the way Mannimarco both ascended and didn't after Daggerfall).
...
WOW, that took a lot of typing. Sorry if it was long-winded, but I've had these theories brewing for a LONG time.
