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UDY on the Surface by CommanderBullet
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
15 Nov 2025
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Summary
It's been a few years since Monsters returned to the Surface and lots of things have changed... Accompany your favorite characters from Undertale, Undertale Yellow and Deltarune as they try to manage their everyday responsibilities and go through a few wacky adventures while at it in this slice-of-life crossover AU.
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Mettaton and Muffet become the king and queen of the Underground after Asgore's tragic death. Will they do a good job or is the power getting to their heads?
This was originally supposed to be an AU so if it doesn't follow the timeline perfectly or characters act different, that's why.
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Frisk Gets Adopted By A Skeleton (UnderAdoption/AdoptionTale) by Cat_On_A_Keyboard, CheerfulForest
Fandoms: Undertale (Video Game)
15 Nov 2025
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Summary
Sans lives alone with his baby brother in an old house on the outskirts of New Home. He raises him to the best of his abilities. One day, he hears the doorbell ring. He opens it and finds an abandoned child. A human child. He has no idea how they got there. The only thing left with the child was a note. Sans reads the note and learns the orphan's name. Frisk.
Series
- Part 1 of Frisk Raised In The Underground
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Half-Tale: The Fallen by HolmesJaw
Fandoms: Undertale (Video Game), Half-Life (Video Games)
15 Nov 2025
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Summary
Corporal Adrian Shephard, a US Marine Corps soldier assigned to the HECU division, was sent off to Black Mesa for 'cleanup duty'. Despite the hell he went through, the marine somehow manages to escape the dangerous, alien-ridden facility against all odds and, after being 'detained' by the ever elusive G-Man, is then assigned a new mission many years later... to the UNDERGROUND!
Accompanied by Chara Dreemurr, the first fallen human turned apparition, the two journey through the unprecedentedly large Underground for one, very specific goal... but what exactly was it? And is that all there is to it?
In... time, all will be revealed.
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History of DUSTSHIFT by DUSTSHIFT
Fandoms: Undertale (Video Game), Storyshift (Undertale AU), Dustshift (Storyshift Take)
15 Nov 2025
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Summary
A three-part summary of the history, world, and events leading up to the primary narrative of Dustshift, a Storyshift Genocide Route take, starting from the very distant past before the war broke and led to the Monsters' sealing inside of Mt. Ebott, to the present with Chara.
Series
- Part 1 of DUSTSHIFT
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Summary
As you walked you failed to hear the screams of terror of a bus going over 100 miles per hour and the sounds of it starting to bust down- it speeds near the sidewalk—the people in it shriek. Their blood curling screams didn’t occur to you, your headphone quality being way too good. Your shoulders relaxed as you stretched your limbs; very much unaware of the danger and pain that would very much make your life way more miserable. You should move out the way. But- likewise, you are unaware. Of death flickering and time excited to cut your strings.
The bus is almost out of energy- and has been stopped.
Or so people thought.
It began to tilt- right where you were very much slowly walking. Andddddddddd—
It didn’t crush you to death.
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If Angels Have Halos Do Skeletons Do To? by Tiddlywinks9
Fandoms: Undertale (Video Game)
14 Nov 2025
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Summary
After three years of dating you find yourself pregnant with Sans' child. You find yourself alone as Sans dumps you not believing the child is his. Managing single motherhood and a job at the flower shop you find love once again with another skeleton in a orange hoodie who strangely looks like your Ex's brother
- Language:
- English
- Words:
- 3,206
- Chapters:
- 1/1
- Kudos:
- 3
- Hits:
- 29
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Another Ending by Zekyn
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
14 Nov 2025
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Summary
What if one pivotal moment had gone differently? Chara and Asriel find themselves facing the aftermath of choices that could have ended them both.
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A rewrite of the college fic that I wrote. I really wanted to redo it and make it better because I spent a lot of time building it. I don't know if this counts as my own AU because there's other college AUs and stuff, but this is my take.
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In the timeline with the happiest possible ending, the heroes of the Delta Rune get to live the rest of their lives in peace and harmony!
Or at least they would if they, and the rest of Hometown, weren’t a load of weirdos. These are just some episodes in the irregular and sometimes stupid lives of the heroes of prophecy and their families! -
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Summary
Monsters have appeared from a mountain, in your town! Interested in this new development you head home with high hopes. Sadly it seems humans will be humans, and for some reason you keep getting caught in the cross fire. Luckily you've made some new friends to help you out along the way!
You were just about to head into the nearby town when your phone went off, it was a text. From Otto of all people. A video of him, and what looked like monsters walking behind him. "You should come home (Y/n), things just got interesting."
Reader is female (sorry) there will be smut at some point, don't know when though...
Series
- Part 1 of Blood N Bones Stuff
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OVERWRITE Aftermath - Chapter 1: The First Domino by OVERWRITEDimp
Fandoms: Sonic the Hedgehog - All Media Types, Undertale (Video Game), Dragon Ball, Five Nights at Freddy's
13 Nov 2025
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We all like crossovers, right? They couldn't possibly get out of control...right?
After a chain of events lead to Sonic and a few others getting assimilated into the world of XTale, many changes occur as the rules of the Omniverse change to keep itself stable, which sets off a chain reaction that will change reality forever. -
Unexpected Hero by LemonCake64
Fandoms: Undertale (Video Game), The Legend of Zelda & Related Fandoms, The Legend of Zelda: Twilight Princess, Deltarune (Video Game), The Legend of Zelda: Ocarina of Time
13 Nov 2025
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Summary
“Not so fun being stuck in some loop right? Trying to fight to protect what ya got, not getting a choice in it. If I had the choice I wouldn't remember either.” The words oddly felt comforting. Link let out a slow breath, closing his eyes for a brief moment.
He didn't feel alone for the first time in a long time.
And that?
That was terrifying.
“To be honest, I kinda gave up a while ago. Just sat back and let the chaos go on, felt like nothing I did mattered anymore. Everything would just be reset anyways. Stopped caring what happened, that was until you showed up.” The skeleton’s eyes bore back into the Hylian.
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The Ghost Souls Before Spider Halloween Mania by LonelyFanboy48
Fandoms: Undertale (Video Game)
12 Nov 2025
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Summary
Frisk and their monster groups are preparing for their first ever Halloween. However one red ghost from The Underground took over the holiday, of what Halloween actually is. But they aren't the only ghost with ghosts of Yellow, Green, Blue, Purple, Orange and Cyan, meet Frisk's groups to help them through the horror mania of Halloween itself.
Muffet herself, refuses to get anything between her and her spiders but with the red ghost in control, her life and pride is in jeopardy after living out of The Underground. But Frisk will protect her and her spiders even if it means of putting themself in harms way. While giving her the Halloween she and their friends actually deserves.
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A Tale of Stars And Time by Pikapuff30
Fandoms: Undertale (Video Game), Deltarune (Video Game), In Stars And Time (Video Game)
12 Nov 2025
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Summary
A Tale of Stars And Time is a crossover AU/AT that combines both Undertale and In Stars and Time. Originally inspired by a few memes/fanworks of Siffrin in Undertale, this concept does exactly that – take the characters from ISAT and shove them into Undertale and see whatever the heck happens next.
The general plotline involves Siffrin going through their usual time looping shenanigans in their own world when, mysteriously, a strange grey door appears in a hallway that definitely wasn’t always there. Upon closer inspection, Siffrin and co. are suddenly thrust into the very beginning of the Underground. They are soon met by Frisk, a strange child with more to them than meets the eye. Now, the six of them will journey through the Underground, meeting familiar friends and dangerous foes, with plenty of surprises along the way.
A new play is about to begin, so get on stage, stardust~!
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Frisk Starling should've been used to cases like these. After all, it was her duty to investigate. Give the victims their voice back, catch the sick freak who did it and give the broken families the justice she couldn’t have for herself.
That is until a string of murders throughout the county begin to appear. Women used like toys, mutilated and disposed of for the cops and journalists to find with only the tiniest slivers of useless evidence and the glaring fact that all the women...
Every…
Single…
One…
Look almost exactly like her… Frisk begins to wonder if maybe… the monster she's hunting down has turned her into the hunted.
And God, does she make the most exhilarating, delicious prey yet…
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You have had a tough life that has left you scarred and untrusting of others. Growing up in a mage family obsessed with power and ensuring their lineage, you are the black sheep of the family, possessing a green soul of kindness and excelling in healing and growth rather than the combat magic your family specializes in. Trapped in a loveless relationship with a controlling, abusive partner chosen by your family to ensure a 'proper' match, you live in fear of triggering his anger, often resorting to your magic to heal yourself. Every aspect of your life is controlled by someone else, leaving you resigned to survival and scraping together what happiness you can.
What you could never foresee is the way a miserable night out with your fiance would lead you to a drunken one night stand with your soulmate.
Nor could you predict you would have 9 more soulmates out looking for you.
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The Hungry Games by Rhaya_Awandah
Fandoms: Furry (Fandom), Disney Theatrical Animated Universe, Pocket Monsters | Pokemon (Main Video Game Series), Looney Tunes | Merrie Melodies, どうぶつの森 | Animal Crossing Series
09 Nov 2025
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48 tributes from various different worlds and universes suddenly find themselves in an arena where their only way of escape is to be the last one alive. The catch? The only method of killing allowed... is predation. No biting or blood. Just pure swallowing.
47 prey, only 1 survivor.
Who will be the Hungriest Predator?
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Author's Note:
This is a project that has been set up and decided by random rolls of the dice, as a dedicated hater of popularity contests where only the mainstream choices ever see the latter stages of a competition. Now, everyone had an equal chance at winning or losing, and no amount of audience participation will change it. Better hope your favorites won their rolls~
If you'll notice the Fandoms, you'll see that there's nothing except the Furry Fandom listed despite the massive cast present. Blame the tag limit. The characters themselves are more important to be listed than the fandoms anyway.
(Edit: I managed to cram in the most important fandoms.) -
Another Phantom / Act 1: Intwined by CrumbleKoek
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
08 Nov 2025
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In a timeline where things kept being slightly off, the first drastic change happens when Ceroba succesfully gets to Hotland with Clover.
However, the consequences of this action slowly become evident, as things don't go as anyone involved could have planned.
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Writing ideas that come to me at the moment, which may or may not be inspired by: Music, my drawings (or others), and/or other fanfics/videos.
Series
- Part 4 of Random Writing
- Part 4 of Oh, look at a fanfic with one of the fanchilds!