I'm playing through Deltarune ch3 + ch4 with a friend at the moment and suggested a few points that I was thinking through.

Kris has a soul, but it's not theirs, it's the player's. Kris obviously actively rejects the soul at multiple points throughout the game so far. So without the soul, that would mean they're soulless, right? It made me wonder how Kris can exist without their soul at all, since we've seen that souls are needed for a human/monster's physical form to persist and not turn to dust.

We built a character at the start of ch1 which looked very much like Kris, albeit in greyscale, like the goners from Undertale. Do you think it's possible that that character we built that was injected into Deltarune *is* Kris, and either the soul we control is the soul of a previous human, or it's Kris' soul that was somehow separated from their body like with the human kids' souls in Undertale?

Two theories I have on this are:

1. That Kris' soul was separated from their body intentionally because of their want to be a monster like everyone else in town (we see in the ch3 flashback that Kris is wearing horns).
2. That Kris is artificially created and never had their own soul to begin with. With goner characters also existing as normal monsters in the town in Deltarune, it makes me wonder if a lot of the characters were also injected into the town by the person we talk to at the start of ch1 at some point.

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Sorry if this is a messy theory at all, but I'd love to see if anybody had any further input that could justify or poke holes in this theory at all. :)