The AU Issue

Tbh. There is no use in creating an undertale AU anymore. There are so many and different versions that it has probably been done before. Your version would never get noticed when there are AU's within AU's. 2 - 4 AU's mixed together.

We all know Underfell, underswap. Because they were made early on.

So please, stop making another AU that is uncreative, cringy and unnecessary. Heck, it's almost impossible to even find a name that isn't used yet.

You won't get fame. Only cringy outcomes.

List of aus taken from the AU favorite. This is not even all.

The basic theme of Undertale is changed, flipped, or modified. Most of these AUs have their own versions of the characters.

Alterfell

Ancienttale

Astertale

Astraytale

Auratale

Belieftale

Blighttale

Cardtale

Cheftale

Chesstale

Coldtale

Cyborgtale

Dancetale

Darktale (1: PokeGirl151)

Default

Demitale

Digitale (1: Nabuco88)

Digitale (2: serac111)

Dreamtale (1: tTOBIi)

Dümmchentale/Dummietale

Eclipsetale

Elementaltale (1: reyindee)

Elementaletale (2: Hawkmask101)

Element-tale

Emotale

Emotiontale

Epictale

FightStory

Finntale

Formtale

Genderswap

Gloomytale

Happytale

Hardtale

Haventale

Hometale

Hopelesstale

Humanitytale

Hungertale

Hymmnetale

Icytale

Inversetale

Joseontale

Legendtale

Linetale

Lucktale

Magmatale

Manatale

MartialTale (1: JelliJelatin)

Mettatale

Miloswap

Missingtale

Monofell

Morphtale

Musical Tale

Mythitale

Negatale

Nextale

Not A Tale

Offtale (1: LessSess + MBDprojects1234)

OppositeTale (1:kellenkyo)

Orphantale (1: PrincessMistyMire + TheLunarPrincess15)

Overtale

Pastrytale

Petale

Positale

Puritale

Reflectiontale

Revoltale

Rewindtale

Royal Souls

Seventhtale

Singtale

Sorcerytale

Soultale (1: Burning-Sol)

Soultale (2: MultiMugen)

Spadetale

Spectretale

Stylishtale

Sugartale

Technotale

The Fallen Knight

True ChaosTale

Twistedtale (1: BlazePandora)

Ultratale

Under-Band

Underbed

Underbend

Underborn

Underchill

Undercute

Underfalse

Underfates (1: sonicgirl313)

Underfell

Underghost

Underglitch (1: MikeyDoesArt)

Underguild

Underhaven

Underheart

UNDERHOPE

Underill

UNDERJUKU

Underkeep

Underlovania

Underlust (Heavy NSFW content)

Undernight

Underscape

UnderShock

Understeam

Undertoy

Underwar (1: Hamatopurity)

Underwar (2: BlueWolfArtista)

Unexpectedtale

Unifell

Vintagetale

X-tale

Concept Change

Character designs stay the same but the basis of the story itself changes.

Altertale (1: Pastelaine)

Anatomical Anachronisms/Asgore's Wars, Within, Without

AngstTale

Arttale

Bikertale (Light NSFW content)

BlueRoseTale

Bluetale

Brotale

CalmTale

Chaostale

Conqueredtale

Copy_Tale_

EssenceTale

Forestale

GZtale

Heart and Soldier

Hybridtale

Hypertale

Powertale

PurgaTale

RisingTale

Saintale

SoullessTale

SplitPersonaliTale

SportsTale

TopTale

Symphonytale

Underloop

Undermystic

Underpire

Underscape

Undersick

UnderSlayer

UnderStone

Understrife

Undersurface

UNDERTALE :: Enlightenment

Undertall

UnderThread

Unknowntale (1: neko_fell-chan)

Outside the Underground

The story does not take place within the Underground.

Aethertale

Alternate Universe Police

Arabiantale

Arena Tale

Beggartale

Cloudtale

Utale

Cybertale

Darktale (2: jessa33)

Deeptale

Dreamtale (2: ParanoidFluff)

DrugTale

Earthtale

Enchantedtale

Fairytale

Fantasytale

Justicetale

Kingdomtale (1: Deaths-Wonderland)

Life on the Surface

Mountaintale

Oceantale

Orphantale (2: MysticTeaDancer)

Other Story

Outertale

OVERGARDE

PinoyTale

Play-TimeTale

Rainbowtale (1: kirbypuff326)

Reapertale and Reverse Reapertale

ReincarnaTale

SBTale

Scholatale

Seatale

Skeletale (1: SBReece)

Skytale

Spiritale

Survivortale

Tribaltale

TropicTale

Underfates (2: SparkyBytes)

Underfight Club

UnderIsle

Undermafia

UnderONLINE

Under_Pray

Undersail

Undersea

Understat!c

Undertale: The Faithful

Undertravel

Undervirus

Unknowntale

UT Gangster

UTmob

Zephyrtale

Species Swap

The species of all the characters have changed. Being changed into objects also works here.

Blookytale

Cattale

Demontale

Gargoyletale

Nyandertale

Rainbowtale (2: MisakiMagic)

Thundertale

Underscale

Underswitched (1: shadowrosa6)

Underwolves

Woventale

Zodiactale

Switch Up

Some or all of the canon Undertale characters swap roles with the other canon Undertale characters. e.g: Sans replaces Toriel. No new characters are added, and the story is relatively the same for most.

Altertale (2: Friisans)

Blendertale

Changed Fate

Changetale

Displacedtale

Equationtale

Fableturn

Inverted Fate

Jumbletale

Lateshift

Messtale

Mirrors Change

Modtale

Storyshift

Storyspin

SuperSwapTale

SuperSwitch

Swapdertale

Swapspin

Switchedtale

Tale Mix

Tale's End

Taleshift

TaleTwist

Twirling Incidentally

Underchange

Underchanged

Underscramble

Underswap

Underswitched (2: C4MIL0)

Undertrade

Undertwist

Universe Change

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Special Event

Everything in the timeline would have been the same to canon Undertale if it were not for a specific event that changed the direction of the story within the reset-able timeline. This means after Frisk falls down. The change affects most or all characters, otherwise it belongs in Few Characters.

AbandonedAU

Aftertale

Amalgamate!Asriel

Amnesiatale

Anomalytale

Astraltale

Blendtale

Burstale

Choice

Chronotale

Clocktale

Combined Hopes and Dreams

Corruptionfile.UT

Cursedtale

Dustjar

Echotale

Fallentale

File-1

File Loaded

Foundlingtale

Fusiontale

Futuretale

Fracturetail

Glitchtale

Insomnia

King Papyrus

LASTtale

Lonelytale

Megatale

Nexttale

Nexustale

Notale

Once Again

Overwar

Petaltale

Rebirthtale

RiseTale

Ruins!AU

Sadtale

Sametale

Securitale

Sondertale

SORRYTale (1: RessurectedNightmare)

Soultale (3: thepeng101)

Swaptale

The Thought (Omega!sans)

The True Hero

ThreeTale

Underdeath

Underglitch (2: Dimonds456)

Underlevel

Underlight

Undermess

Under_MyShelter

Underplead

Undersanity

Understanding

Understay

Undertale: Chaos Edition

Undertale: Save

Undertime

Zombietale

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Few Characters

AUs that do not affect all of the characters. These include headcanons, extensions, and flat out new ideas.

Tweak

One or very few characters are tweaked within the story. They still live within the Underground.

Afterfell

ArachnoTale

Ashtale

AurumTale

Baby Bird

Baby Blasters

Blind Frisk

Broalgamate

Chara!Sans

Chasriel

Comic Papyrus

Corrupt Beast Sans

Dreemurr Reborn

Electrotale

EmptyTale

EPOCHTALE

Experiment-Undertale.exe

Fataltale

Frisk's Anomalous Adventures

Gasterfell

Generationtale

Goopytale

Grouptale

Guardtale

Half-Hearted Dreamers

Impaired

Innocent!Chara

Judgement Hall

Lost Vessel

Needlessly Complicated Sans

Pasttale

RemembranceTale

Reset!Frisk

Royal Babybones

Science Sans

Shadowtale

Siblingtale

Skele-Frisk

Something's Missing

SoulSwap

The Lost Sibling

Underding

Underhuntre

Underline

Underpatch

Undershift (1: Magainita)

Undertone

UnderTruth

Voidreversal

What Are Friends For

Add (OCs)

One or very few new characters are added to the story of Undertale or replace existing characters. They still live within the Underground.

Akintale

Beyond the Stars (Más Allá de las Estrellas)

Charise

Chisk

FriendshipTale

Innotale

OrchidTale

Qarms/Qarmic Sans

Rewind

SecondTale

Shadowtale

Sithtale

Undercontrol

Undertale: Multiplay

Undrrdell

Unstable Souls

Wanderertale

Wishtale

Out-of-Code Characters

One or few characters are able to jump AUs and travel the multiverse, usually having a home base in some sort of void or pocket dimension. Some can only view other AUs.

Abysstale

A Child and a God

CORE!Frisk

Datatale

DEADtale

Doomtale

Dreamtale (3: jokublog)

Errortale

EquilibriumTale

Flower sans

Inktale

Light-tale

Mirrortale

NoLifeTale

One in a Million

Paint-Thinner!Sans

Re-Mixtale

RipTale

Sentinaltale

Skulltale

Statictale

Stringtale

Timetale

Ticktock!Sans

tumblr!Sans/Techno!Sans

Undersane

Vixentale

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For the LOLS

AUs that are purely made for bringing a smile to your face. Some are cute, some are funny... A lot aren't very serious.

Acidtale

Bazookaswap

Canadtale

Chill

Christmas Party

Chromotale

Craptale

Cubetale

Dundertale

Failtale

High Quality Tale

Jalizatale

Jerrytale

Just A Head

Kindertale

Lennytale

Littletale

MagicTale

Mettasansey

Nekotale

Nintendotale

Nootnoottale

PTA Undertale

Randomtale

Russiantale

Sanstale

Shiannesetale

Shiptale

Skypetale

Spritertale

Studiotale

Tale From Below

Treetale

Undercrap

Underdog

Underfail

Undertail (VERY heavy NSFW content!)

Underfresh

Undernovela

UnDERPtale

Understale

Underwear

Undynetale

Voodootale

Weabootale

Yoshitale

Youngtale

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Horror

AUs with the goal of creating something scary, insane, or disturbing. Some AUs that follow the genocide route are also found here, but not all are geno-route-only. Some possible themes include suicide, drug use, alcohol use, depression, death, gore, insanity, disfigurement, etc.

Alimagtale

Anti-Physicstale

Asylumtale

Bloodtale

Brokentale (1: hummingkitten)

Brothertale

Chaostale

Charatale (1: Chica-the-chicken101)

Comatale

Darkertale

Disillusionmenttale

Distortale

Dust-Tale

Faketale

Fearstale

Flowey is Not a Good Life Coach

Flowriel

Fonttale

Forgivenesstale

Forsakentale

Frettale

Handplates

Hangingtale

HELPtale

Horrortale (1: Unknown)

Horrortale (2: Sour-Apple-Studios)

Infecttale

Lifelesstale

Lightless-tale

Manstale

Masktale

Mercytale

Monstertale

Morbidtale

ONCEtale

OverDosed

Playbacktale

Powdertale

Predator

Shadowfallen

Sixbones

Sorrytale (2: DragonArtStudios)

StRaNgE/\Tale

Subject 52

Tales of Emptiness

The Demon and the Angel

The Purpose

Twistedtale (2: sansylovely)

Underchosis

Undercode

Underdark (1: deathwithundertale)

Underdarkness

Underdread

Underelectricity

Underhell (1: z0mb3xor)

Underinferno

Underscare

Undershift (2: Sans-Skelebro)

Underslept

Undersurvival

Undertaint

Underterror

Underworld (1: coulsart)

Underworld (2: Two--Faced--Angel)

Und_rt_le

Worthtale

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Crossovers and Parodies

A mixture of a story, game, movie, TV show, book, or personal characters and Undertale.

Stories

Crossovers between Undertale and a book, comic, or webstory.

Creepytale (1: karma2u)

Creepytale (2: Lupus-Tontrue)

Diverge

Fullmetal Undertale

Helltale (1: TheGeneralofSouls34)

Kurotale

Nationtale

Souldust Crusaders

The Heros of Underground

Trickstertale

Trickstervirus

Urbantale

Undergames

Understuck (1: FlintIsTrash)

Understuck (2: PumpkinLOL)

Warriorcatstale

Warrior's Tale

Warriortale

Television

Crossovers between Undertale and movies or television series.

Anime and Cartoon tale

Applefell

Anurtale

Berktale

Bill!Sans

Bunkertale

Calcium Man

CrusadeTale

Detectivetale

Disneytale

Dragontale

Friendship and Determination

Gametale

GarnetTale

Gemtale

Gothamtale

Guildtale

Kirbytale

Lunatale

MarbleTale\UnderHornets

Marveltale

MylenaHoodTale

Nevertale

NZTtale

RWBYtale

Shiningtale

Simulatale

Slendertale

Spongetale

Steven's Tale

Stranger Tales

Undernatural

Who Tale

Wondertale (1: unknown)

Wondertale (2: mintlovingkitten)

Wundertale

Yu-Gi-Tale

Games

Crossovers between Undertale and another game.

Angel-Tale

AnOFFtale

Bordertale

Candy'stale

Dr. Underdote

Embodiment of Undertale

Engietale

Fallouttale

FNAFtale

Foundationtale

Geometrytale

Hedgetale

Ibtale

Into The Stars

Kingdomtale (2: Ashlex-in-pearl)

Madnesstale

Majoratale (1: Smieska + Owlyjules)

Neptunia x Undertale: The Saving Heart

NiGHTale

Papertale (1: mr-pengu1n)

Pokétale

Portale

The Green Soul in the Underground

Touhoutale

Trainertale

UnderHill

Undermon (1: Unknown)

Undermon (2: thegreatrogue)

UnderNaf

UnderSky

Under Story

Undertale Fortress 2

Undertale Mystery Dungeon

Undertoad

Underwatch

WoWtale

Xenotale

Yanderetale (1: Yandere Dev)

YandereTale (2: Tanyt262)

Other

Any other kind of crossover or parody, including real people or real life events, original characters, or a combination of many things.

Beatlestale

Charatale (2: CraftingChic)

Creative tale

Crossovertale

Crosstale (1: PolishCrossoverFan)

Cross-Under

DeviantTale

Hostiletale

Legandstale

Mytale

OCtale (1: askmesnekvince)

OCtale (2: byehelena)

OCTale (3: nicothekiller123)

Of Monsters of Undertale

Phoenixtale

Portertale

Steamtale

Swantale

Thaumatale

Thompson's Tales of the Underground

Trashtale

Underette

Undertronic

Vocatale

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AUs of AUs

AUs that are a combination of two other AUs or modifications to pre-existing AUs.

An Icy Echo

Arsonfell

AUtale/Ourtale

AU Tournament

Fatal_Error

Flowerfell

Heavenfell

Horror!Ink

Maidtale (Moderate NSFW content)

San's SSD

Suicidal Blueberry

Swapfell/Fellswap

TurnedSwivel

Undertemper

Underverse

-----------------------------------------

Community Shared

AUs made by large parts of the community as a whole, instead of by just one person. These are not collab AUs.

Disbelief Papyrus

Floweypot

Jaspertale

OFFtale (2)

Personatale

Ponytale (1)

Temmietale

Underfalls/Gravitytale

Undertalia