Wait, you've had a seamstress homey this whole time...I'm back to

This is coupled with the fact that they just call it "Nikki".

I think the difference of it and something like Pazuzu is that you can see the influence of Pazuzu. The transformation is apparent, whether it's Regan or someone else. The entity in Nikki is only showcased as Nikki. It doesn't change her body in a way to separate it from her.

Carrie...