This is the master post of all my current undertale fanfics that i have been working on. To make it easier on my brain I put all my references in their own chapter in a separate series on the top so that none of the fics get weighted doing and are easily linked in the currents works.
Upload Schedule For Larger Fics: Tuesdays (updated 05/25/2026)
Update Schedule for Reader Fics: Wednesdays
Upload Schedule for Smaller Fics: Whenever I can between those (Maybe on Thursdays)
An Archive of Our Own, a project of the Organization for Transformative Works
An Archive of Our Own, a project of the Organization for Transformative Works
An Archive of Our Own, a project of the Organization for Transformative Works
An Archive of Our Own, a project of the Organization for Transformative Works
An Archive of Our Own, a project of the Organization for Transformative Works
An Archive of Our Own, a project of the Organization for Transformative Works
This one is a little bit shorter than normal, but I like following the different groups I've managed to work out. I think I have one more follow up to do and then we get back to the main part.
=This is a master post for killer!sans it will be updated constantly=
Killer!sans is a what if scenario
what if sans join the human and did the genocide run
for that his code changed because of the player
to know more >>>
Can I use your artwork as profile picture or edits?
Yes you can as long you credit me
Can I dub your comic?
Yes you can as long you credit me
Can I sell merchandise of your art?
No if I didn’t agree to it you can’t sell anything using my art pieces
Can I use AI with your work?
No I don’t want my work to be used by AI please
Can I sell my own art of killer!sans?
Yes you can as long it’s not my artwork or AI I don’t mind
Can I use killer!sans in my drawing / comic / fanfic ?
Yes you can
Killer sans he acts detached and playful on the surface, but underneath is emotionally unstable, obsessive, and deeply dependent on external purpose.
Chaotic and theatrical He likes provoking reactions, joking during serious moments, smiling when things are uncomfortable, and turning violence into a performance. He often acts like he’s “having fun” even when he’s mentally spiraling
He is emotionally numb… but not truly empty the idea that he wants to stop feeling pain him having muted emotions or forcing himself not to care. But cracks show constantly anger, jealousy, fear of abandonment, guilt, attachment
Dependent on validation or purpose often latches onto someone or something to give him direction. Without that, he can become lost, unstable, or self destructive. That’s why he intensely loyal once attached
Self destructive He tends to ignore his own wellbeing, emotionally and physically. him treating himself like a weapon rather than a person.
He jokes to avoid sincerity. The more serious the emotion, the more likely he is to deflect with sarcasm or exaggerated behavior.
Dissociates when things get too intense
He often feels like someone trying to convince himself he no longer cares while every action proves he actually cares too much.
___
!!EVERTHING IS CANON!!
The timeline of killer!sans is like a tree branches there are so many possibilities
there will not be fixed canon timeline or ending
it's what if scenarios
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the most known ones are
Good ending killer sans ( Red )
The “good ending” for Killer Sans is less about becoming a perfect hero and more about finally reclaiming his free will and emotions.
In the original "Something New" , Killer was trapped in endless genocide timelines. After remembering every reset and all the suffering that came with them, he fell under the Player’s influence and became obsessed with feeling "something new” over time, he slowly lost his sense of self and forced himself into emotional numbness.
Eventually, he was taken in by Nightmare Sans and became one of his weapons. But instead of remaining trapped under Nightmare’s control, Killer met Color Sans. Color recognized that Killer was suppressing his real emotions and living like a puppet, and helped him break free from it all.
For the first time in a long time, Killer finally chose his own future.
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Bad ending killer sans
After endless genocide timelines, Killer Sans becomes mentally shattered from remembering every reset, every death, and every hopeless loop. Eventually, the Player offers him a deal instead of suffering endlessly for nothing, he can join them and finally “feel something new.” Desperate to escape the emptiness, he accepts.
Even after separating himself from Chara, Killer still cannot escape what he has become. The damage left behind continues to consume him.
Before he can erase himself or reset everything, Nightmare Sans appears. Sensing the overwhelming negativity, despair, and instability within him, Nightmare recruits Killer into the Bad Sanses.
Nightmare then manipulates Killer’s fractured soul, keeping him emotionally dependent and using him as a weapon. Instead of finding peace or healing, Killer becomes trapped in yet another endless cycle.
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unrelated : The omen wings (UTOW!Sans)
"Unrelated the Omen Wings" is a what if continuation story of Something New. In this version, Killer Sans decides to return to his AU and plans to give it the good ending they never had.
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The what if's killer!sans
just a fun concepts if killer get the other souls insted of determination
more aboout the #what if killer!sans
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Q&A
#ask killer!sans tag
how did you decide on the name Killer?
I didn’t name him it was an ask I really wish I remember who suggested it
When I made the first comic something new I wasn’t planning on actually making a sans au I was just missing around making comics then people started suggesting names for him until I got an ask saying name him “killer sans”
The Soul Stages ( it will be updated )
1.
Killer begins reconnecting with genuine emotions.
He regains personal choice and identity.
Attacks are defensive and reactive
2.
Numb
Dissociated
Shows sadistic humor
3.
Kills without hesitation
Emotional unstable
Obsession at the max
4.
???
Is there a human design for Killer!Sans?
!! EVERY HUMAN KILLER DESIGN ARE CANON !!
My favorite kind of characters design are androgynous
Part about killers character that he is like Chara and frisk in a sense his actions got influenced a lot by us the player
So I made him resemble a look of a fallen human plus a look that make you feel like they can be your friend or they can be scary monster…you know like an angel
Also I don’t think the universe of undertale / deltarune got gender rules when it come to how the human and monster dress if it means boy girl or anything which I really love honestly
I also love people interpretations when designing killer human form it’s just so creative and seeing their thoughts are so interesting ! ^^
#human!killer
Dose killer got a playlist
If Killer weren't a Sans, which character could he be?
Here’s a list of the characters/music that were big influence and inspiration while writing killer
what is killer!sans fighting style ?
killer style of fighting is a speedster he dodges a lot and makes sure to understand the opponent before he attacks
killer also likes to provoke and tease them so their opponents lose focus + Also killer is a little dancer so he dances around them
Killer play pretend a lot to get their opponent’s sympathy
He also has two fighting styles, depending on the enemy
Weapon style:
if the enemy is easy or if killer is bored
he fight's like a human
he’s very fast in both long range and close combat. He has been killed by you guys many times in many different ways, so he had to learn a lot of skills from those experiences.
He can use multiple weapons, but he mostly prefers knives. If the encounter isn’t boring, he might also use his magic.
more>>
Magic Style:
if the enemy is interesting or strong
he fights like a monster
but
Whatever the style the downside is that he needs to stay focused to keep his monster soul and Determination balanced. If that balance slips, he starts coughing up more black liquid.
Does Killer have hobbies?
he likes drawing
mostly backgrounds and objects
Is Killer in a relationship?
yes with color!sans
art by @superyoumna
!! EVERY SHIP WITH KILLER IS CANON!!
This is the end of the master post. Thank you for reading! I hope I answered all your important questions ^^
Its starting to get a bit warm and I will be posting the chapter tomorrow instead of tonight. Right now I just need to eat and take care of myself while I work on the chapter to get it ready for y'all tomorrow.
Y’ALL, I’M LITERALLY SHOOK. On May 10, right after posting this, my account randomly got banned… Ugh, I was talking to support for SO long — thank god it all worked out. I just got back in like literally now, LET’S GOOO!!
I've made an update to my upload schedule for the fics I am currently and will write in the future. The schedule is listed in the pinned master post.
A few other updates. Relationships from The Yearly Ball and Out in the Multiverse will be changing once I start for the rest of Echoes of The Past . I am just no longer seeing those relationships as viable for the future and it feels forced to have them.
I am also taking a little more time with my reader fic of Reader X SwapDreamTale Nightmare to get the feelings out I want to convey. A lot of heavy shit I plan on adding and I want to give those subjects the attention they deserve.
I am just going to stop posting times for this entirely XD Every time I get home from work I de stress and just want to take my time XD But this chapter was still fun to write as we catch up with some of the skeletons in Ebott City.
New Beginnings and Old Wounds - Chapter 16 - Catchin' Up In Ebott
New Beginnings and Old Wounds
Chapter will be released later in the day (its 1am est here in the states). This will be somewhere collectively around 530P-600P. I have some finishing details to add to this chapter before it's ready to go live.
For You I'd Do Anything (Cross X Dream aka Cream)
Fear not. I am still working on this. I have just been busy and am doing my best to finish it out and I think with this one we are going to move onto the final ship from The Yearly Ball prior to the OCxFanon.... That means a Swap (toxic) x Dust (nontoxic). With that final relationship the Our Little Loves, For Good or For Bad will be finished ^_^
As promised I kept the schedule of at least one of the fics. I am still not feeling well and am running out of cold medicine which I will be going to pick up again. So for now here's the two chapters I promised ^_^ Please enjoy.
New Beginnings and Old Wounds (Chapter 15 - As Time Goes On)
Out In The Multiverse (Chapter 28 - The Final Prep)
PS. Had to get creative with the links since like the postcard ones dont work right half the time.
My gift this weekend was a cold that has made me feel god awful and throw itchy.
I was going to take the time off today from work to work on getting the chapter out for Out In The Multiverse, but it's been painful to get it up and out of the way.
As for New Beginnings and Old Wounds I should have that on schedule, but I'm also doing all of this while sick.
I am staving off the AO3 curse with medication and pure spite.
Sooooo here's the chapter.... I made an adult decision and fell asleep when I got home from work. Here is the next update for New Beginnings and Old Wounds
