A black octopus sans who is fueled by negativity.
People like to make the joke they are Mr tentacle hentai
brother is a yellow positive cupcake
Who's your favorite sans?
yo, Nightmare Sans
A sans from the AU Dreamtale, he is the Guardian of negativity
Person 1 : who is your favorite sans
Person 2 : Nightmare sans
Person 1 : why
Person 2 : because it's nightmare sans