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Undertale: The Fallen Reploid by MahinaPea11, The Observer (MahinaPea11)
Fandoms: Undertale (Video Game), Rockman X | Mega Man X, Undertale Yellow
23 Jun 2025
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(A cross-post of an Undertale Crossover on DeviantART of mine that I'm re-working into a fanfic)
While out on a mission in the Ebott Exclusion Zone to deal with a rogue Mechanloid, Axl finds himself curious about a legend surrounding the place and decides to stay behind to explore after convincing Alia that he'll be careful.
Things go wrong and soon Axl finds himself lost in a world of Monsters and with a strange newfound power. With no way to contact HQ or teleport out, Axl must journey through the Underground on foot. Along the way, meeting new friends and foes while also learning that listening to his trigger finger isn't the only option to solve a dispute.
Will he become the savior that Monsterkind and a group of outcasted Reploids speak of in an ancient prophecy or will he perish like the human children that came before him?
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The Fell monsters have never gone into heat before, have never heard of it. Now that they've reached the surface, though, it's only a matter of time before biology reasserts itself.
Few of them are taking the news all that well.
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Love. An emotion that carries a lot of weight and impact behind it. An emotion that can create beautiful memories and destroy the happiness of others. An emotion that can be tool to create and a weapon to destroy. But what happens when one human and three monsters get involved with such a powerful emotion. Following a big mistake in the Dark World, the four are about to get a damn good idea of what love can do to an individual.
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It all started with a housewarming party where only you showed up. Now, you're tangled up with multiple skeletons and a woman that hates your guts for no reason. As much as you want to act like you don't care, you really do, so what do you do now?
It's not like you can survive on your own.
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The real world can be a cruel place.
There is no Dark World. No Lightners. No Darkners. No prophecy to set forth a chain of events to whisk away tears and make everything right. No chain of coincidence to magically and miraculously mend broken bonds and build friendships anew.
In the Real World, there is only Kris—lifelong loser and social outcast. Amidst a broken home, an unrequited childhood crush, and the myriad other struggles of adolescence, they want nothing more than to live a Regular life—to be normal—to blend in.
Yet, try as they might, the universe has other things in mind…
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Swift and soft like a suckerpunch by MilesHasGoodMannersAndThatsWhatMatters for Creeky_Cricker, TheLibrarbrian
Fandoms: Undertale (Video Game)
23 Jun 2025
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You are what they call a 'Big Tiddy Goth GF', or whatever that means. You're tattooed and pierced and curvy. Wearing dark clothes and black lipstick like armor. Working as an editor for a smut novelist, you're happy and thriving.
You enjoy having your boyfriend Landon by your side. He isn't perfect, but no one is! He treats you well enough.At least you think he does.
Until, you meet Sans Serif at a pool party and you can't help but doubt how good of a man Landon is...
Are you REALLY happy?To top it off, you're starting to get sick in the mornings...
probably just a stomach bug, right?? -
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Unable to help themself (as much as they tried to curb any growing dependence), Kris stuck their finger between the bars of the cage to skim the Soul’s exterior. They felt the Soul’s diffidence, as if it was internally wondering, Are they mad at me?
“That wasn’t nice, what you did to Noelle and Berdly today,” Kris said, assuming a voice like their mother giving a lecture. “I know we went back and redid it, but that doesn’t mean it didn’t happen, you know. That’s an hour in the cage, to think about what you’ve done.”
(Takes place after the events of Chapter 2, but Kris creating a Dark Fountain isn't acknowledged, since we don't know where that's going to go. Also, the Vessel will name themself Goner.)
Series
- Part 14 of Yandere Characters
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You're a hermit. Meaning you basically never leave your home unless necessary.
One day, you come home from your bi-weekly shopping trip, when your neighbour tells you some exciting, yet worrying news:
Monsters are real?
Certainly they wouldn't come near you.Eventually, you find therapy, meaning you have to leave your home more.
But it's much to the delight of a certain skeleton who's laid his eyes on YOU. -
Sick To Death (Of Me Chasing You) by CrossoverAU
Fandoms: Undertale (Video Game), Alice by Heart - Sheik/Sater/Sater & Nelson
23 Jun 2025
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Raine was sick. Really sick.
The kind of sick where, despite not knowing what she had, she knew she didn't have long left.
Her best friend Sans knew that too.
Not wanting her to live her last moments trapped in her house, Sans read her one of her favorite stories, Alice in Wonderland.
While chasing her through the pages, Sans learns that he loves her too much to let her die.
Will he be able to let her go or will he try to selfishly stop the clock?
Aka an Undertale/Alice By Heart crossover fic because I couldn't find one
Note: knowledge of Alice By Heart isn't needed to read this fic!
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Frisk, the beloved Ambassador for Monsterkind has just suddenly up and vanished.
No one knows where she went.
And she's being charged with murder.
Sans has been her bodyguard since the first day that Frisk took them all down to the city of Ebott.
As the Judge, he may be her only hope of finding the true culprit.
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A Third Chance by NullVol
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
23 Jun 2025
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Very few people get a second chance at life, but what if someone had the chance at a third?
Tags are subject to change.
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The arrival of monsters from Mt. Ebott threw society into disarray. Not only was a previously unknown species discovered, but the shattering of the barrier released centuries of magic back into the world. As society struggles to move forward from their bad history with monsters, MOPA, “The Monster Obligated Placement Act” was formed. As such, all mages must provide housing for a minimum of one year for a MOPA designated monster family.
Having jumped through enough hurdles to kill a horse, you are finally forced to house a family of your own.
Between eight skeletons of varying color schemes, your reluctant past, forgotten dreams, and a desire to make up for your sins, you are forced to use your wits in a world breaking at the seams.
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You were always so warm.
Too bad you didn't exist.
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Living in Snowdin could be rough. With his nagging younger brother, the 'kill or be killed' mentality, and the human runt who kept coming around to release them from the Underground, just to throw them back in again because something was missing - he was tired. Exhausted even.
So, when he starts dreaming of a lover - someone to hold - someone soft and warm and humorous, he starts losing his typical edge. Even though you're just a dream, he's keenly aware that there are somethings that no one's taught him before... but you have.
Papyrus has started to notice something's... off. And so has Frisk.
Series
- Part 1 of Sweetheart Underfell Sans
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You babysit Frisk for extra income whenever Toriel has to stay working later hours at her new school for monsters and humans.
Until, one day, she calls saying she can't make it, and that someone else will come to pick them up.
That's when you meet him: a skeleton monster looking as haggard as a shipwrecked man, and smelling of smoke and booze.
You offer him some dinner and a cup of coffee over some small talk, and then, he gets comfy on your couch.
It feels bad to ask him to leave, so he ends up staying the night.
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A fanfiction set after the Pacifist route. The characters you love are here : growing, evolving, finding their place on the surface. But with change comes the unexpected. And nothing will unfold quite the way you imagine.
New faces will appear too, including a young human woman who gradually becomes part of the group, discovering them, and herself, through fresh eyes.
This is an immersive story. Unpredictable. Sometimes funny, sometimes emotional, sometimes unsettling. Chapters will shift in tone and length, often illustrated, and with interactive moments where YOU get to decide what happens next. Just like in the game, you’ll have power. Or at least the illusion of it.
Forget what you know. Forget what you’ve read. Set your expectations aside and take the plunge.
- Language:
- English
- Words:
- 7,244
- Chapters:
- 3/?
- Hits:
- 9
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A stand-up comedian with a bad temper and low motivation ends up falling for Frisk's homeroom teacher, her irritatingly soft voice, and her smug attitude.
Who would've known?
There's probably a lame old joke hidden in there somewhere, but he doesn't give a damn about that right now, so maybe come back later, and he'll think of something.
(Mostly told from his perspective, but there will be chapters featuring Second Person POV.)
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Grillby knew he still had much to remember, but he enjoyed their time together. Though an unspoken thought haunted him: What had happened before Gaster disappeared? Grillby never brought it up for fear of frightening his love. He was sure the memories would come in time.
In which Grillby begins to remember the sad memories.
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Deltarune AU with the plot of Jennifer's Body/Ginger Snaps and other additional headcanons that I wrote for fun.
Susie and Kris get attacked by a mysterious creature, causing only her to get infected and possibly lead her to becoming a mindless, killer beast. -
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The forests of Underfell are expansive. When the Fell brothers investigate in one of the worst blizzards of the Underground, they find something unexpected.
Series
- Part 1 of A Rogue What?!
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Frisk has faced danger and death many more times than any child should ever have to, but they aren't out of the woods yet. Being the first human in who-knows-how-long able to use magic has shoved them back in the spotlight. And just when their life was settling down into whatever counts as "normal" for the town of Ebott's Wake, where monsters sell ice cream and the gym teacher thinks anime is real.
It's nothing they haven't had to deal with before at this point, but that doesn't mean it's going to be easy, even with Papyrus taking over as Ambassador and the Finest scientific minds in the town working on a way to help Chara. After all, the first fallen human climbed Mt. Ebott for a reason, and it wasn't a very happy one.
And now, that reason knows about Chara too.Series
- Part 3 of We're Not Weird, We're Eccentric