Asyldin and Demoux

[Sami she/her]

Question: I heard something about Asyldin and Demoux being on Roshar (looking for Hoid?). How do we know that the foreigner is Demoux, and where do we see Asyldin in Mistborn/Roshar?

[+Extesian he/him]

So, we know Demoux is on Roshar during WoR, he is hunting Hoid at the Purelake along with characters from Elantris and White Sand. We also know Demoux and Aslydin are both worldhoppers, in the Seventeenth Shard. We do not not know, however, that Aslydin is also on Roshar. I'm fact, from the below WoB it's kind of implied she is elsewhere. 

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QUESTION

Is Thinker from the Purelake scene Demoux [from the Mistborn Trilogy]?

BRANDON SANDERSON

Demoux is indeed in that scene.

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LIGHTYLANTERN (REDDIT)

Thanks a lot for doing this, Brandon. You're my favourite author, and I have a million things I want to ask you, but since I'm not the only one asking questions, I'll ask the ones most important to me.

...
2. In The Hero of Ages, Demoux gets together with a woman named Aslydin. He's then seen on Roshar in The Way of Kings. Knowing how loyal Demoux is, he wouldn't just leave Aslydin behind like that. Is she connected to his reasons for becoming a member of the Seventeenth Shard?

BRANDON SANDERSON (REDDIT)

2) Aslydin is in the Seventeeth Shard, and had her own work to be about. I've given subtle clues about her before, but the ethnicity of the name should strike you

As for how we knew it was Demoux, people on this site figured it out from his appearance and demeanor I think, then confirmed it with Brandon.

Edited August 1, 2017 by Extesian

[Calderis he/him]

40 minutes ago, Sami said:

Question: I heard something about Asyldin and Demoux being on Roshar (looking for Hoid?). How do we know that the foreigner is Demoux, and where do we see Asyldin in Mistborn/Roshar?

Demoux is one of the three in the Purelake interlude in tWoK. I understand how Galladon was recognized by his speech patterns, and I've seen the confirmation of Baon as blunt. I think that Demoux was recognized by his scar. 

As far as Aslydin, I've seen nothing suggesting she's on Roshar before this. 

Edit: and ninja'd with a better response. 

Edited August 1, 2017 by Calderis

[Pagerunner he/him]

One of the other Seventeenth Sharders called Demoux by his name; Ishikk understood it as "Temoo," but he just heard it wrong. That, the scar (earned during the end of Hero of Ages), and the fact that Demoux is based on Brandon's old roommate Micah, clued people in enough that someone was able to get confirmation at a signing.

[Calderis he/him]

16 minutes ago, Pagerunner said:

One of the other Seventeenth Sharders called Demoux by his name; Ishikk understood it as "Temoo," but he just heard it wrong.

I totally missed this. I remember the "Temoo" but the connection with Ishikk not understanding didn't register, and that make so much sense.