#undertale masterlist

NSFW is in BOLD

Yandere is ITALICIZED

Part1/Part2/Part3

Started: 4/16/2024

Updated: 6/4/2024

Undertale masterlist 1

Undertale masterlist 2

THE BAD GUYS:

Characters: Nightmare, Killer/Blade, Dust/Ace, Horror/Ted

Reader with wings

Angel reader

Skeleton Bunny reader

Extra short reader

Meeting Nightmares ex

Mafia guys getting a wife after crashing a rivals wedding

Reader with no self preservation

Princess reader

Their reactions to POLY relationship (+Chaos)

Comforting a crying child (+Chaos)

(+Chaos) squishing their cheeks

(+Chaos) lurking in their walls

(+Chaos) taking the boys belonging

(+Chaos) reaction to reader disappearing after an argument

(+Chaos) reader with a period

(+Chaos) reader with bad self-esteem

THE STAR SANSES:

Characters: Dream, Ink, Swap, Berry

Skeleton bunny reader

Meeting Nightmares ex

THE ORIGINAL TRIO:

Characters: Classic, Swap, Fell

[Not anything yet]

THE DOOMSDAY TRIO:

Characters: Reaper, Error, Ink

Male wife s/o

THE COOL TRIO:

Characters: Epic, Fresh, Cross

[Not anything yet]

THE NERD TRIO:

Characters: Sci, Berry, Dust

[Not anything yet]

OTHERS:

CHAOS SANS X READER

CHAOS X READER | CRUSHING ON HIM

CHAOS PICKING THE READER UP WITH HIS TENTACLES

SEPERATE:

CLASSIC (Undertale)

SWAP (Underswap)

FELL (Underfell)

NIGHTMARE (Dreamtale)

DREAM (Dreamtale)

INK (Inktale)

BERRY (Swapfell)

HORROR (Horrortale)

DUST (Dusttale)

KILLER (Something else)

ERROR (Errortale)

CROSS (X-tale)

EPIC (Epictale)

SCI (Sciencetale)

FRESH (Freshtale)

REAPER (Reapertale)

A/N: I actually put some effort into this masterlist. I think you've also noticed that I've put the Sanses into groups. I did that cause I don't want to write the post in there 1 million times. I also took out the Papyruses, because I realized that I can't really write them yet... Maybe I'll make some changes to that in the future, but for now, I'll stick with the Sanses.

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Bone Brigade

@janeelyakiri Kissing lessons scene

@skitteringjunbug The boys at the beach

@janeelyakiri Scenes with Axe!

@hanzidanzi Stretch and Blue in chapter 52 🔥

Actually a meme but it's relevant and funny goddamn it so it's here

… ok maybe a few more memes

@skitteringjunbug Red on his bike!

-

General Art

@janeelyakiri Blue and Aerial Hoops

@janeelyakiri 's Hound meets Valkyries Mutt

@skitteringjunbug Meme War

@janeelyakiri @valkyrieofsmut @hanzidanzi A New Challenger Appears!

@jaythedweeb Affectionate Axe and Bun and Red

@goodgollymissmeli OCs combine!

@leekmeeks Cute sonas!

@leekmeeks Lustfell!Sans

@janeelyakiri flustered Gull

@leekmeeks drawing friends ocs

@skitteringjunbug Birthday drawing!

@janeelyakiri Spicy Crow

@hanzidanzi @skitteringjunbug and @valkyrieofsmut as Blue and Red!

@janeelyakiri Gull is snek

@valkyrieofsmut Swap sans in a Sailor Moon outfit

@goodgollymissmelli Axe loving Mc's Aunt Flow

@valkyrieofsmut Having talented friends

@hanzidanzi Doodle spree!

@hanzidanzi Teasing angry cat Val

@hanzidanzi CHIBI CULT

@hanzidanzi Mafiafell Sans and Foxy Val!

@janeelyakiri Happy birthday from Gull

@skitteringjunbug Birthday comic

@totallylulalutiacreations Birthday art

@wolfbeestudio Birthday kitty

@janeelyakiri Kiss time!

@hanzidanzi Date night

Sans: Human!Reader is able to use magic and Classic!sans is a witness Reader pulling their soul out of their chest while US!sans, UF!sans, and SF!sans are petrified Cuddling with UT!sans, UF!sans, and HT!sans and falling asleep at the end Papyrus: Nothing here! Come back later!

Toriel: Nothing here! Come back later!

Undyne: Nothing here! Come back later!

Alphys: Nothing here! Come back later!

Mettaton: Nothing here! Come back later!

Asgore: Nothing here! Come back later!

Gaster: Nothing here! Come back later!

Frisk: (PLATONIC DEPENDING ON THE AU) Nothing here! Come back later!

Chara: (PLATONIC DEPENDING ON THE AU) Nothing here! Come back later!

"Undertale" + "Deltarune" Fanfiction Masterlist

Celebrating Christmas w/Sans

Muffet x Reader: General Headcanons

Mettaton x Snarky!Reader Headcanons

Mettaton x Dramatic!Performer!Reader Headcanons

Mettaton x Underconfident!Reader Headcanons

Mettaton x Reader Fluff Headcanons

Mettaton w/a Darling Who's Practically An Angel

Mettaton x Fem!Seamstress!Reader Headcanons

Mettaton x Poetic!Reader Headcanons

Mettaton w/a Darling Who Likes To Draw

"Come Cuddle, Idiot!" (Mettaton x Reader Fluff Oneshot)

Mettaton x Optimistic!Reader Headcanons

Queen x Reader Platonic Headcanons

Rouxls Kaard x Reader Fluff Headcanons

Rouxls Kaard x Reader Fluff Headcanons 2

Rouxls Kaard x Reader Fluff Headcanons 3

Jevil x Reader First Date Headcanons

Jevil x Sassy!Reader Headcanons

Jevil x Reader: General Headcanons

i am no longer accepting requests for this fandom

listed below is everything that i have published on this account for the canon of “undertale”. characters are organised by their main names and au versions are noted in squad brackets.

(crossed out links are pending posts)

mettaton

hcs — being in a relationship [here]

hcs — trans masc s/o [here]

hcs — chubby s/o [here]

yandere hcs — general [here]

muffet

hcs — being in a relationship [here]

hcs — segmented fluff alphabet [h / r / v]

undyne

(As suggested by this post!)

(2025 UPDATE: I no longer post long fics or multi-chapter fics on Tumblr, only one shots. You can find the long fics mentioned here on my AO3 account: vidrioborroso).

(Also, all the writing linked below is VERY old. Please, be warned!)

Underfell Papyrus