Demons in Reign of Winter?

[Mortavius]

Going to finally start my Reign of Winter campaign on Tuesday.

I have two PCs who have demons in their background. One is a Monk who thinks he has a demon in him (whether that's true or not, I haven't decided) and the other is an Aasimar Sorcerer with the Daemon bloodline (and a good background).

I haven't read all the APs yet, so I'm wondering if there are any demons in the modules as written that I can twist around to fit these characters backgrounds?

[Luna eladrin]

Spoiler:

Yes, there is Kostchtchie in Maiden, Mother, Crone. You can easily add extra cold-themed demons to this adventure as well.

[Erik Ingersen]

I'm done with book 1 and 2,Reading book 3 now.
Not many, if any, evil outsiders yet. You could easily installed them though. The witches have the spells and morality to do it.
Very early on, the opponents get the opportunity to scry on your heroes. When they reach her in book 2, Nazhena could easily have had the time to research an ancestor of one player or another friend that could make the encounter way more personal.

[Brandon Hodge]

Chapter 5 has...

Spoiler:

...a suite of shadow demons, a derghodaemon and a thanadaemon (the Coffin Man) in Baba Yaga's Hut, a meladaemon is integral to the plot in the prison camp, and Rasputin has an erodaemon consort (Serafina) in the finale. Have fun.