That's an interesting concept.
I have serious head canons about the player character and how they relate to certain NPCs from Skyrim and other games.
For example, the original "Saryn" character I made was the cousin of the two women that ran Sarethi Farm. But since then there have been about 5 other Saryns. I just can't name male Dunmer anything else.
It says skeever. And it's a magic skeever that can talk, like Barbas.
Anyway. I'll be sure to post more of my head canons here when I think of them. It's one of those things that you can't remember when you're trying to remember it, you know?
But, in case you're feeling deprived, I'll leave another form of head canon here for you:
I've always assumed the same thing with the Ulfric- Rikke relationship... I think it's the moment during the Greybeard peace treaty that sells the idea to me.
I have a lot of head cannons however now I'm trying to think about them i can't remember any
One I do know is that I always say that Lydia is corrupt, no idea why it's just something I do.
If i think of anymore I'll post them
My new and improved head cannon is that Auriel agreed to help creation because Kyne did. Kyne agreed to help Shor because they were in love. Auriel didn't read the Contract for Creation, which stated that they will be bound to Mundus, and he signed it anyway. This binding clause was seen as trickery, and Auriel and Shor became enemies. Jealousy for Kyne's love brewed is Auriel's heart and soon war broke out between Shor and Lorkhan.
It is a tragic love story, one of rejection, and vengeance.
My headcanon is that Vex is secretly into Delvin, despite how she acts towards him. I mean, hasn't anyone heard of the whole "he/she acts like she doesn't like you, but that means she's into you" thing? I think Vex just doesn't want to ruin her reputation in the Guild by hooking up with an old guy like Delvin.