Responses
I do have to agree with your segment on Perrat. Like his whole darkened face whenever he saw them together happened since the very very beginning. Maybe it's because Kyte would always have what he couldn't have? But as a loyal supporter that doesn't make that much sense, also since he barely has any interactions with her. Like just cuz you saved a girl doesn't mean she will fall for you.
As for your passage theory, it makes sense. Like technically isn't Wein not a real person either? He was just written as someone who was from the "real" world but he technically never actually existed in her world.
I can't be the only one who thought Perrat falling in love with Vasser was a little off, right? It just felt too jarring. I know that he fell for her when she got hurt protecting Kyte, but after that it just feels like timed events that are like, "Okay, this situation seems kinda sus but I'm gonna pretend that it's just caring and not love that cuz it feels wrong." It didn't feel like a natural love, you know? Now every frame Perrat's in just kinda shows him brooding over Vasser and Kyte, which also doesn't feel like him despite the fact that he's heartbroken.
Also, I have to wonder if the passage to the "real world" is really to the right one. Even though it's supposed to be the same world, the guys that reincarnated are still technically characters created by Vasser, which would in turn mean that the world they came from was also created by Vasser. Maybe the passage that lead to the real world was only a pseudo "real world" which is why it prevented her from going through?