[@Raddum]
Thank you for having a decent grasp on Undertale and at least one variation.

Would there be Pokemon running around?  Whether they count as wild animals or intelligent beings kind of vary.  If they are being spawned like the Koopas, wouldn't they be innately hyper-aggressive?
Because if animals I can see Mr L picking a few off so he would have something other than his mushroom-based shakes.  He wouldn't trust Sans's cooking but he may swipe a few cooking ingredients that don't seem off yet.

Although I wonder how Swap Sans would respond to an obvious egotistical jerk.  Would he look over the jerkitude and try to focus on some nice aspect (real or imagined)?  Would he be a bit disheartened that there is at least one being who is not charmed by his wonderful charms?