Do we know who The Sovereign actually is?

[Skryter he/him]

We know it's almost definitely Kelsier, just not exactly in what form.

Has Kelsier managed to tie himself to the physical realm, and or acquire a new body? Is it Spook spiked and being used as a proxy by Kelsier, etc?

I guess what I'm asking is do we know, presumably per WoB, what exactly is going on here?

Edited August 20, 2018 by Skryter

[Zath he/him]

Here's a couple relevant WoB's, with the most relevant one at the end:

Quote

Questioner

The Sovereign...

Brandon Sanderson

Mhm.

Questioner

...has a <nail> in his eye. Which eye is *inaudible*

Brandon Sanderson

I am going to RAFO that one. Just in case.

Questioner

Has Bloody Tan seen the Sovereign?

Brandon Sanderson

*laughs* So... here's the thing-- and this is why I'm RAFO-ing these, it's not because of what you think. I'm RAFO-ing these because these the nature of the Sovereign, and who they call the Sovereign, and these sorts of things is stuff that I want to potentially leave for Secret History 2-- or for [Secret History] 3, if I write more Secret Histories. So the answers are probably simple, right? And they're not ones that are gonna be mind blowing. But I don't want to lock myself down until I've written those, which is why I'm RAFO-ing most of the questions dealing with this, okay?

*a moment later Brandon overhears continued conversation about Secret History*

So, oh, you were asking it that specific way to not give spoilers to someone here? Yeah, I see what you're doing. I see-- I thought you were trying to wiggle out of me something that you weren't trying to wiggle out of me.

Questioner

Not everyone here has read...

Brandon Sanderson

I get it, I get it. I see what's going on.

Questioner

We're not trying to be that *inaudible*

Brandon Sanderson

Okay, okay. I was misinterpreting the intent of those questions a little bit. Yes, being very tricky. Okay. 

*pauses to sign a book*

So the answer of which spike is it? I can answer that one? *interruption* Or really I can tell you--it's in my notes, and I don't have them, but it's not particularly relevant--it's the opposite side of the one where Death's skull was crushed. 

Questioner

Oh, yes. Yes.

Brandon Sanderson

They would look like mirror images if you saw them.

source

Quote

Questioner

In Bands of Mourning, we learned that the Sovereign, who they confused as being the Lord Ruler, came after the Catacendre. [He] was their god, was their king and god. And then Kelsier looking for a string. Is the spike somehow connecting Kelsier's soul to Spook's body.

Brandon Sanderson

No, good question. It is connecting his soul with his body, his current body, but it is not Spook's body. That's a great theory.

source

Quote

Questioner

At the end of the last Wax and Wayne book, which I love, that statue that they though was the Lord Ruler. It was Kelsier.

Brandon Sanderson

That was Kelsier.

Questioner

Ok. I thought so, because the way the other thing ended with the eye, the eye thing was throwing me off and then I went and grabbed the secret thing and I was like "No that can't..."

Brandon Sanderson

That is Kelsier.

Questioner

And will we find out more in the next Wax and Wayne book or do we need to wait and find out more later?

Brandon Sanderson

You will find out more in the Wax and Wayne book, really that that's going on there is foreshadowing for era 3, and for future Secret History stories if I do them. So the Wax and Wayne books are not about the return of Kelsier, but the return of Kelsier is very important for later things in the series.

source

And in Chapter 23 of The Bands of Mourning, it says that the statue in front of the Sovereign's Temple is a statue of the Sovereign.

The statue is of Kelsier.  The statue is of the Sovereign.  Thus, Kelsier is the Sovereign.  

We know it's not Spook's body, and we know there are numerous scars on the forearms, similar to Kelsier's original body.  Beyond that, it's pretty much guesswork.  We probably won't know for sure what's going on there until we get a Secret History 2.

Edit: Ninja'd!

Edited August 20, 2018 by Zath
ninja'd!

[Calderis he/him]

This should answer your questions 

Quote

Questioner

In Bands of Mourning, we learned that the Sovereign, who they confused as being the Lord Ruler, came after the Catacendre. [He] was their god, was their king and god. And then Kelsier looking for a string. Is the spike somehow connecting Kelsier's soul to Spook's body.

Brandon Sanderson

No, good question. It is connecting his soul with his body, his current body, but it is not Spook's body. That's a great theory.

source