>>718983160
You mean the thing where they play the triumphant rendition of the main theme called "YOUR POWER"?
https://www.youtube.com/watch?v=sb71Mz8Cbtw

The idea that "this thing in the game can't represent me unless I have total agency over it at all times" is an idiotic kind of autism. Nobody sincerely believes that this is a reasonable argument to be making.
Like all of Toby's game projects Deltarune is partly about exploring the relationship and role of a player within a game, and in any game where anything is supposed to happen there are going to be things that inevitably have to be done to progress. You can't refuse to seal the fountain because the story needs to progress. You can't tell Kris to side with Susie instead of Ralsei in Chapter 1 or make Kris kill Susie or refuse to go get the chalk with Susie at all because then the video game you're playing wouldn't happen. You are a character in the story which means you have a role to play in it, and while you're allowed a lot of leeway in how you do it you can't just do whatever you want, that's just not how video games work, you are inherently limited by what the game allows/requires you to do no matter what.

>>712580801
They're part of your party
You DETERMINE their FATE