1 - 20 of 22 Works in Something New Sans | Killer-centric (Undertale)
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Killer gets kicked out, nightmare has sent him to an au he doesn't completely recognize.
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Killer has a bad day, and sort of forgets his meds.
!!Self-harm is pretty detailed in this fic, please make sure to put yourself first! I won't be mad if you skip this; you'll get the jist in later chapters!!
Series
- Part 3 of "Killer's Dumbass Choices."
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Killer has a secret hideaway in the castle, a cramped, dim space filled with blankets, pillows, and small comforts. When the world becomes too much, he retreats there to calm his mind. Dust finds him one day and simply stays, offering quiet presence and gentle support without words, letting Killer feel safe in his small shelter.
Series
- Part 80 of Undertale Fics
- Part 90 of One-Shots / Two-Shots / Three-shots
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Cross was beginning to miss when tears would fall from his eye sockets, at least then he knew he could feel. But did any of that really happen or were they just memories he was created with? Everything he remembers had a chance of not being real. An imitation of life, just like him.
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Kross enemies to lovers, anyone? 😏🫴🍷
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toxic killermare oneshot i guess read it if u want i actually suck at summaries
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Suspicious as hell, with their hood up while they glance over their shoulders. No way they ain’t here for him, he figures.
They don’t speak when they slide into the booth across from him. He doesn’t either, just tilts his head and leans back in the filthy booth, giving them his usual empty grin. They faintly shudder, but he gets very little satisfaction out of it. Scaring people just by existing is only funny for so long before it starts to get boring.
The hooded figure across from him slides him a note. He plucks it up and examines it, leisurely reading through the impersonal, computer-printed text on the page.
Target: Xans ‘Cross’ Xaster
Age: 24
Appearance: Skeleton monster, 5’10, small red scar beneath eye, one red eyelight and one white
Job: Escort subject to private location. remain until called.
Payment: 25,000G in cash after job is doneNow, see, Killer doesn’t really have the luxury of turning down money like that. And especially not since they already discussed what he’s doing before they ever set up this meeting. Nobody even has to get hurt, so he figures the money’s worth the effort.
Series
- Part 4 of September Mini-Fics 2025
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My hatred grows, my determination intensifies. The dust surrounding me is insignificant compared to my rage toward the human. "I regret nothing," I say before unleashing my fury.
But then, Chara's words haunt me.
"Feeling something new, huh? I want to try again."⚠
- "Semi-Canon"
- This is just a fanfic that will likely end as soon as I run out of ideas. If you don't like what you read, I'm inviting you to leave! Thanks for stopping by! -
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This is sort of a college AU, it isn't based on the canonical multiverse nor relationships.
The characters may be extremely mischaracterized, I don't care honestly. This is just my life but with sans AUs bc I can't find another method to cope with it.I may or may not finish it, I'll probably upload when something big happens in my life or something, sorry for gramatical mistakes and not being constant in my work.
Anyway have fun reading :]- Language:
- English
- Words:
- 2,340
- Chapters:
- 1/?
- Kudos:
- 4
- Hits:
- 35
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(TAKES PLACE IN THE FUTURE OF MY OTHER ONGOING WORK, 'A Gang of Mentally Unstable Delinquents'! PLEASE GO READ THAT FIRST!!)
killer and swan bonding time
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“It doesn’t matter. It’s not our responsibility to take. Someone else will come but not us.” He hears a melodic sound; a hum. Lights in hums and it sounds like…. like something very nice. He’s moved a little and he sobs, thinking it’s the end of it.
But if they are here then maybe, it’ll be better. He would be fine with it.
The warmth stays though. “It doesn’t have to be us,” he hears a smile– if that’s possible, “it can be me. Just me.”
“Dream, no.”
Dream decided to raise an abandoned lab rat to Nightmare's utter dismay. Surely, nothing will go wrong.
or, the twins try to play parents and fail miserably.
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Killer’s life had one mission; Kill King Nightmare before he can produce an heir. It was all he thought about for thirteen years. Putting up with abuse and torment and brutal train regimens. And now? Now, on the night of the summer festival, he was going to accomplish is mission.
(A high fantasy Sans AU.)
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A Chaotic Piece About Killer Losing His Fucking Mind and Being a Self-Sabotaging Bitch by App1eS0uce
Fandoms: Undertale (Video Game)
23 Sep 2025
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Trigger/Content Warnings for Overdosing, Hallucinations, Throwing up/Vomiting, Being unsure of one's reality (please let me know if there’s anything else I missed)
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Another Killer.
In his room.
“What the fuck.”
“Hello, Killer.”
Series
- Part 7 of Killer’s Krying Korner
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Killer wants the human on board, and is really excited about it despite the earlier 'introduction'.
The human in question doesn't seem as pleased as Killer does.
Series
- Part 2 of Creature(s) onboard.
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This is my tribute to MTT Week on Tumblr. These are fics focusing on the Murder Time Trio in duos, singles, and of course the trio. I’ll label whose the main characters in the chapter title.
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He thought aliens were fake, just made up lies to scare kids away from asking, because how else would they exist?
Apparently, he was so, so wrong.
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The alien bad sanses and human cross nobody really asked for!
Series
- Part 1 of Creature(s) onboard.
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Killer never said goodbye.
Never told Color how much he mattered to him.
And after all this time, Killer is finally starting to feel the weight of everything he never said.Series
- Part 2 of MalvornVerse One-Shots
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“Get a load of this monster
He doesn't know how to communicate
His mind is in a different place
Will everybody please give him a little bit of space?”Or
Killer ends up having a full breakdown during a mission. Good thing Cross is there to sort him out.
Series
- Part 4 of BSP poly moments
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“Unfortunately, I know someone who possesses the ability to bend even the most twisted souls into a… proper shape again. Which means I can never rely on you fully, not without bearing the risk of betrayal.”
Killer may have lost his emotions, but not his impeccable perception. This isn’t a worried expression, but the face of someone who is about to commit the ultimate sin under the guise of self-defense.
He tilts his head, black liquid spilling from his eye-socket. “Pretty sure there’s already a solution for that.”
Nightmare’s face lights up. “Possibly. I need your soul.”Or: Killer realizes how messed up he really is.
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“Will anyone hear our voice?”
His free hand drifted softly to his SOUL, as if it were a fond memory.～～～～～～
On nights like these, everyone is having a bad night.
They're angry, they're sad, they're mad, they're anything but glad.But for the sake of himself and everyone else...
He lets his anger leak out in the form of his own thoughts.Chara and Frisk live inside his SOUL, while their ghosts float about.
They may be bad...
But as long as they all live together, they may as well try to get along.So looking up at the sky, they think, they laugh, and they cry,
If only for a short few moments.
Just to make it through the night. -
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Forced into Stage One after a particularly nasty raid, Killer leaves to another AU in hopes to cool down. Only to find a small furry friend waiting.