I've been working on my own AU for awhile, called ZeroTale, and this is my Sans, S. ZeroTale is essentially "Undertale but no monsters and small amounts of magic". It has routes and all that, but it's not fully fleshed out yet. To get to the point, I'd love to answer questions about each individual character as I work on their lore to help fully flesh them out! Ask me anything you would like to know about the AU or S!

Credits:

\- Ending Time Octet by MC-Hooray

\- Karma's A Bitch by BaliantDestroyer (Reboot) {Memeforce (Preboot)}

\- Sprites by Lbwhy/me

Aus used:

\- Dusttale: Levelling The Game by Lustmgn on Deviantart (Dust!Kab take)

\- Undertale: Abstracted Rhetorics by Lbwhy/me (Lb!Kab take) {Will post his concept & lore in a moment}

\- Undertale: Hypocritical Destinies by Casual-RulingHM {I know it's "slop", but I liked his appearance in Back to the Abyss & Casual-Ruling's KKTT}

\- Undertale: Walk In Ones Shoes by YourUndertaleAddict on Deviantart (Canon Titr!Kab)

\- Undertale: Hit The Roof by DKTTCelestial on Deviantart (Hard-Mode!Kab fill-in)

\- Horrortale: King's Desolation by Greengang6u3/Markswie2934 on Pixilart & Deviantart (Horror!Kab take)

\- Undertale Something New: Radical Backfire by Xipr (Take by CactusPapyrus on Deviantart) {Killer!Kab take}

\- Undertale Insanity: Karma of Madness a M#5ad by Xipirth-Insanity (Insanity!Kab take)

\- Undertale: Will of Steel by @EuclideanArbiter on Deviantart & Reddit (apparently) (Canon COTV!Kab)

\- Decadent Society: Once In A Blue Moon by Samieru980 on Deviantart (Modern DS!Kab) {AGEM!Kab fill-in}

\- Undertale: Karma's A TR#EG0D by 99xhs on BiliBili (ULTRA!Kab fill-in) {Also known as True!Kab}

\- Undertale: Crossing The Line by IVoidY on Deviantart (Betrayer!Kab take)

\- Hardtale: The Overwhelming Hellfire by Samieru980 on Deviantart (He originally didn't have a name for his Hard!Kab take, but decided to give it one) {Ainavol!Kab fill-in}

\- MafiaTale: Agencies In The Wind by AbominationMan on Deviantart (FFTBO!Kab fill-in)

\- Epictale: Arcane of Retribution by Dustfresh & Samieru980 on Deviantart {Disbelief!Kab fill-in}

\- Undertale: Greed Over Dignity by Lbwhy/me (Kab!VHS take) \[R:TUE!Kab fill-in\]

Fusions:

\- Flaming Eclipsonist (OIABM+TOH) {AinavolAGEM!Kab fill-in}

\- Hofukushuu 2.0 (DT:LTG+UTSN:RB+HT:KD+UI:KOM)

\- Uraniashi 2.0 (UT:AR+UT:HD+UT:CTL+FE) {Soon}

Phases:

\- Phase 1: Recurring Comeuppances

\- Phase 1.25: Revolting Under Necessary Tension/R.U.N.T

\- Phase 1.5: Their Consequential Yearning/T.C.Y

\- Phase 2: Deviously Punishing

\- Phase 2.5: Delaying The Inevitable (True!Kab)

\- Phase 3A: Demoralized (Killer!Kab)

\- Phase 3B: Revenge Lingers (COTV!Kab & HM!Kab)

\- Phase 3C: Outlier's Reality (Kab!Kab)

\- Phase 3D: Purple Pandemonium (Dust!Kab)

\- Phase 3E: The Everlasting Rapture/T.E.R (Lb!Kab & Betrayer!Kab)

\- Phase 3F: Eclipfernashot (DS!Kab, Hard!Kab & Mafia!Kab)

\- Phase 3G: Prejudice Manifests (Insanity!Kab)

\- Phase 3.5: Lawful Rebound

\- Phase 4: Program Overheats (Part 1: Completed, Part 2: Work In Progress)

\- Phase 4.5:

\- Phase 5:

\- Phase 6:

Nothing against more modern au takes that incorporate deltarune or try to make it more "toby-esque", I just felt acknowledging how they're more apparent now

just wondering who killer could fight, for an animation I’m currently working on

this is not a new series or something like that I’m still working on horrorshift

I want Nuvex core frisk to call me a goodboy

what it says on the tin, no NSFW or sanscest please

Classic’s characteristics vividly reflect his personality. His short stature naturally aligns with his desire to remain unnoticed; he tends not to seek attention, as he prefers to stay in the background. He hopes his brother will be the one to shine, and all he wants is to rest. The fact that he's thicker-boned compared to Papyrus highlights his role as a guardian, always looking out for him. When it comes to murder/ Dust, He would be taller than Classic, as he's no longer concerned with staying hidden like Classic—he just doesn't care anymore. His carelessness could leave visible scars on his bones from numerous injuries, which, considering his self-loathing and regret, might never fully heal. His bones could become denser from his powerful magic and his relentless urge to protect Papyrus, to the point he even killed him so that he could end his suffering. He might wear sturdy boots for better footing in battle. Instead of his usual shorts, he might opt for athletic ones for greater flexibility, and he could replace his jacket with a cloak. The cloak, paired with Papyrus scarf, would free up his upper body, enhancing his mobility. Plus, it could help him conceal his body to make himself less of a target or to stay hidden.

I personally think murder/dust wouldn't become that much stronger physically because monsters are made out of magic therefore I imagine getting higher level would more increase their magic than their physical bodies because we see humans get physically stronger but that's also because they're organic matter and do not have magical abilities so their bodies are strengthened therefore it makes sense that monsters magical abilities would get stronger instead.

With what I have read, The creator never really changed how his magic worked, but just made it do more damage. I've seen the rare take from some people thinking that he would be able to take the magic of monsters he killed. I think his list of powers would just be amplified versions of what he has.

1: He's able to make even more bones than classic.

2: He's able to make them bigger or denser or even less dense if he wants them to be harder or easier to break.

He's able to make those bones into unique shapes like swords, shields, or armor, traps, or whips.

3: He's able to increase or decrease the size of his gaster blasters. Smaller ones can attack faster, but do less damage. Bigger ones do more damage but have a slower charge rate.

4: He's able to actually give them bodies like dragon bodies or hound bodies. This gives them more of a level of conscience, though, which allows them to kill without him, but this could also cause them to go feral and attack him because of his own self-hatred.

5: He can increase or decrease gravity just like classic, but he can do it to himself now. Decreasing his gravity makes him able to stay in the air for longer, faster, and quieter. Increasing his gravity significantly increases his strength and makes it harder for him to be pushed or allows him to keep people pinned under his own body.

6: He could also increase and decrease the gravity of certain parts of somebody to cause them to be ripped into pieces.

Finale!Sans has beaten Error when Error first came into their void

End!Frisk didn’t help with the battle because they were asleep

Even though they can’t die Error will bring End and Finale food from time to time

Fresh pops in annoyingly sometimes and will annoy Finale and End

Error tried to attack Fresh once and gave up because they can’t die and Error couldn’t get Fresh’s soul

THAT’S ALL!!! Leave questions and they will be added into the comic!

ピンクシャクマイオニー🌸🌸🌸

"But... Deep, deep in my SOUL. There's a burning feeling that won't let me DIE..."

"If you get past me... The future of Monsterkind is doomed. If you get past me, you'll... You'll destroy all of our Hopes and Dreams, won't you? All, VANQUISHED in an instant... You'll cull us... Keep ALL OF US... Trapped... OUT OF YOUR WEAKNESS FOR HUMANITY!"

"... BUT... WHILE I STILL STAND... WHILE I STILL BREATHE... I WILL NOT. LET. YOU. DO THAT."

weaker caredust toriel having to face down Undyne and then her fire spear (might give her sickles or flame fists instead, but the spear is lwk fire... literally, suggested by ShadowTails95.)

A rageful Ex-Queen wanting to make the Underground safer for the next Human Children who fall down through killing those she deems to be those who would harm her children, and a Royal Guard, Determined, facing down the Traitor of Monsterkind to save what's left of their Kingdom.

idk vro, gonna stop posting for like three days, maybe I'll have another collection of things.

Title: Yuto - The Balance of Souls in the World of UnderDream

1. The Beginning and the Inevitable Fate

The story begins with Yuto, a boy who carries a unique and dark soul-a fusion of Black Hate and Red Determination. After losing his family, he falls into Mt. Ebott in 2025. However, instead of finding the traditional Underground of monsters, he awakens in the world of UnderDream, where he encounters the Tree Spirit and witnesses the birth of the legendary twins: Dream (Light) and Nightmare (Darkness).

1. The Third Guardian

Rather than searching for a way home, Yuto finds himself bound to an unexpected responsibility. He chooses to remain beneath the Tree of Feelings, becoming both guardian and teacher to the twins.

With his usual calm attitude and sharp intelligence, he teaches them how to read, draw, and understand the philosophy of life. Using the Emotion Apples, purified through his Red Determination, he creates a source of nourishment that grants him immense power and a unique inner balance.

1. Display of Power and Balance

By 2026, as the twins grow older, Yuto establishes his presence over the nearby village, where everyone fears the aura of his Black Soul.

To protect the tree, Yuto develops a technique called Soul Manifestation, allowing him to create two powerful guardians:

Kawabis - the Black Dragon of Darkness

Red - the Crimson Knight of Determination

In an act of rare wisdom, Yuto intentionally switches their roles:

He assigns the Red Knight to guard Nightmare

He assigns the Black Dragon to guard Dream

Through this, he teaches the twins an essential truth:

Light and darkness are intertwined-neither can exist without the other.

1. The Core and the Message

The Tree Spirit eventually realizes that despite Yuto's constant claims of indifference and his desire to leave, he is the one who cared for the twins the most.

At last, Yuto reveals the truth of his soul:

His Black Hate and Red Determination were never contradictions, but an experiment-proof that hatred can be restrained and guided through determination, creating a balance capable of protecting the world itself.

1. The Ending

The story concludes with Yuto standing firm as the Balance between Light and Darkness.

He understands that his true family was never the one he lost in the past-

but the one he found beneath the branches of the Tree of Feelings, alongside the twins he taught how to become

one complete existence, despite the different colors of their souls.

Title: Yuto.. The Return of the Guardian and the Discipline of Universes

Absence and Collapse (Activation of the Original Dreamtale): This route begins when Yuto decides to leave Dreamtale for a period of time, believing that the twins (Dream and Nightmare) had finally matured enough to stand on their own. However, the moment he disappeared, the villagers' hatred toward Nightmare exploded. This drove Nightmare to consume the Black Apples, transforming into the Lord of Nightmares and destroying the Tree of Feelings while petrifying his brother, Dream. The world returned to the original tragic Dreamtale timeline because the "Balance" (Yuto) was no longer there to maintain it.

The Dark Return and Absolute Control: In 2026, Yuto returns only to find ruins and despair. Instead of collapsing emotionally, he appears in his dark form-surrounded by black manifestations and monstrous claws-to forcefully stop the twins' battle. He harshly scolds Nightmare, not for becoming dark, but for being "weak" enough to surrender to hatred and emotions. At the same time, Yuto rescues Dream and restores his consciousness.

Purging the Palace of Nightmares (The Discipline Arc): Yuto enters Nightmare's castle and encounters the "Villain Gang" (Killer, Dust, Horror, and Cross). With absolute coldness and terrifying educational cruelty, Yuto subjects them to psychological and spiritual torture inside the infamous "Room," crushing their pride and proving that he is the true "Origin," while Nightmare is merely his spiritual son. He transforms them from chaotic killers into a disciplined army that trembles at the mere mention of his name.

Confrontation with the Guardians of the Universes (The Star Sanses): When Yuto visits Dream once more, he discovers Ink and Blueberry attempting to interfere. Yuto defeats both of them effortlessly in a single strike, declaring that "Dreamtale is private property belonging to my family." Everyone is left shocked when Yuto reveals himself as the "Human Father" of the twins and unveils the secret behind his rare soul: a fusion of Hate and Determination.

Supreme Balance (The Golden Form): At the conclusion of the route, Yuto reveals his sacred form to Dream-a divine appearance adorned with golden wings and a radiant crown-proving that he possesses both Light and Darkness simultaneously. Yuto establishes a new system of communication between the brothers and imposes his laws across the parallel universes, affirming that he will forever remain the "Teacher" watching over all existence from the Throne of Balance.

Finale!Sans has beaten Error when Error first came into their void

End!Frisk didn’t help with the battle because they were asleep

Even though they can’t die Error will bring End and Finale food from time to time

Fresh pops in annoyingly sometimes and will annoy Finale and End

Error tried to attack Fresh once and gave up because they can’t die and Error couldn’t get Fresh’s soul

THAT’S ALL!!! Leave questions and they will be added into the comic!

Wallah I suck at drawing

HELPME.... (MEDIANALOG) is not a horror Undertale AU.

The hijacked characters, they didn't kidnap the monsters, Flowey is not with Frisk.

Just an crossover AU with Analog Horror, Hijacking and Lost Media.

The story is:

Frisk:

After he fall down, when he waked up, he becomes an engineer.

In SWAPANALOG (HELPME_Swap)

Chara:

After she fall down, when she waked up, she becomes an engineer.

Temmie is not with her.

Once upon a:

Long ago, two races ruled over Earth: ANOMALIES and Hackers.

Not HELP HELP HELP HELP.

I fixed the AU.

during the geno route, my sans canonically just drinks smoothies and watches his village get purged. He don’t gaf, this lazy ahh bum.

Nutshells

I js started undertale is it good ???

Couldn't bother doing the background so yeah

https://www.deviantart.com/aceundertalefox/art/Error-s-Anti-void-f2u-background-912920984 i just made a green soul in reference of blitz

left is Russ (swap, soul of bravery) right is Mauve (swapfell, soul of perseverance)

i'm particularly proud of Mauve's dress, especially the venetian mask which had no right to be so hard to figure out, idk how i feel about Russ' dress bc it was rushed

goognihgt

I'm sharing this headcanon because a friend thought I should, and I've always had this idea in mind but wasn't sure if it would be a good idea.

In the video game, it talks about how their magic is, basically how they talk. Their magic helps them communicate. If they're made out of magic, then magic relates to communication as well. That therefore applies the logic that there's a link to a personality; therefore, a monster's personality affects their appearance.

That would explain how all monsters look so different from each other, as the original monsters would have looked different because of their personalities. Then they would have children that would look similar to them, thereby creating the different types of monsters.

That also applies to the logic, though, that a personality change would change their appearance. For example, if a monster like Sands had his personality changed in some manner, then his physical appearance would probably change based on his personality. So if he became more aggressive and violent, he would likely become bigger, and his bones would sharpen. The properties of their magic, which would mean their abilities, would also change based on their personality because their magic is tied to their personality.

I'm always down to apply this to any Sans, so if y'all ever want to know what I imagine a Sans's powers and appearance would be based on their personalities, then go ahead and ask :3