>>724713479
The post you're replying to is pretty schizo but "Ralsei is Kris's old horns" doesn't really make sense either when you think about it.
If we just think about Chapter 2, we have the scene where Lancer and Rouxls jump into Kris's pocket to establish how you could move objects/Darkners between Dark Worlds. It would be kind of bullshit if Ralsei was also supposed to be secretly jumping in Kris's pocket, even though you see him waving goodbye while Kris ascends to the Light World and the screen fades to white.
I think Ralsei isn't an ordinary Darkner and might be literally made of "pure darkness," it would explain why he just collapses into a pile of clothes when he's knocked out, why he seemingly has no history or purpose (beyond helping the other Heroes/fulfilling the Prophecy) unlike the other object-Darkners, why he can fly(?), and why he seems so troubled over not being able to "be there" for Susie in the Light World - couldn't he "be there" for her even just an object that brings her some comfort? Aren't other Darkners pleased to comfort Lightners in this way, isn't that what he's been preaching the whole game?
It is true that Ralsei does have pink horns and does uncannily resemble Kris's brother. The theory that Ralsei might be Kris's "monster-sona" or "imaginary friend" from when they were younger could still be true. It actually fits very well with the idea that the Dark Worlds (the first three, at least) are a recreation of the make-believe games Kris used to play with "that girl" when they were younger, as implied by Ramb.
This could even still fit with Ralsei being an object with Kris's old red horns, maybe with them stitched onto a teddy bear or some similar stuffed doll. We know that Asriel has some connection to Seam, and Dess has some yarn and buttons in her room...
But, whatever Ralsei is, Kris isn't carrying him between Dark Worlds.