Submission by @clevercatchphrase
When I first played through Undertale, I found it very amusing that the Snowdin Shopkeeper didn’t realize you were human, even after you’ve completed the Pacifist Route and talk to her before leaving the Underground. But then that got me thinking… exactly how many monsters do know you’re human on sight?
So after a bunch of re-watching other’s Let’s Plays, replaying the game and doing A LOT of talking to NPCs, I’ve come up with three categories: those monsters who recognize you as human, those monsters who clearly DON’T know you’re human, and those whose dialogue still left me unsure due to how they worded it. (Maybe they do know you’re human and just don’t bother to outright say it, or maybe that’s just how they talk to everyone). What’s more, some monsters’ understanding of you change depending on what route you take in the game (mainly pacifist/neutral vs. genocide).
Anyway, this isn’t really a theory or headcanon, but I thought someone out there might be interested in this (not so) little list! SO, without further ado, here are all the monsters and their idea of what you are in the order we meet them.