(Spoilers!!! Do not read this if you have not played Deltarune yet!!!)
I don’t think that was Chara ripping out and imprisoning the soul.
Think about it: The game constantly gives hints that Kris is either controlled or possessed by the player.
The first time you save, you override another save file that has Kris’s name on it. That name is then replaced with the name you gave yourself (the player, not the discarded vessel) at the very beginning.
After you exit the dark world and talk to the other characters, a lot of them comment that Kris seems different and we even get a small glimpse at their personality pre-Deltarune.
And it seems like Kris wasn’t a very nice person.
They were quiet, withdrawn and known for playing pretty mean pranks on the other kids, as well as the adults (tricking Noelle into thinking they were bleeding heavily by covering their arms in ketchup, repeatedly throwing bath bombs into the toilet and flooding the bathroom).
What if that ending was essentially Kris literally ripping us, the player, out of their body so they can have control again?
To get their SAVE point back.
The first Save point establishes that Kris is aware of the save points and probably even used them already, though they weren’t aware of their true potential and didn’t call them save points. To them, they were simply “the strange light that only [they] can see”,
Thanks to us taking that power away from them for a short time, Kris had the chance to observe how it might be used.
Save points can be used to fix yourself in and go back to a certain point in time. A power like that has many uses.
You could play a prank and simply go back when it goes bad for you.
You can cheat your way through life, manipulating people into doing whatever you want.
You can even come back from death.
And if that smile, as well as that knife are anything to go on, Kris now has quite a few ideas on how to use that “light”.
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