Sans C. Gaster

*"most dangerous creation of any society is a man who has nothing left to lose" - James Baldwin,* (Genocide flavor text)

**Outside of A.U alias**: Fallen, Auti

**A.U Type**: Horror

**Age**: 103 chronologically, 50+ mentally, and he stopped aging at 27

**date of creation:***(Sans wasn’t born)* March 24th 1923

**height**: 5″2 (taller than most A.U Sanses who are portrayed around 4ft 6in -3ft 11in)

**weight**: around 15 pounds

**Alignment**: Lawful Neutral occasionally Lawful good

**occupations**: Royal guard worked as an assassin, spy, and tech, he also maintained a post outside the castle gates (1970s-2015), Prince Consort (2012-2015), temporary monarch (December 3rd 2015 - some short period of time), Leader of Snowdin resistance (2015 - 2026), Underground monarch (2026 - onward in neutral endings where sans doesn’t commit suicide) Engineer (2026 - onward in the end of the true pacifist route where he does not sacrifice himself to save Frisk)

**pronouns:** he/him, *(though in underground languages his and all other monsters go by Olo/Olum/Oluk or whatever pronouns they use in their mother/native language if it's not Monstarian, which is a language ALL monsters can comprehend and at least read, write, or speak it.)*

**status:** undead or determinant

**species:** monster, type: Undead, race; Skeleton (possibly half lich)

**Love interest**: Toriel (Deceased wife).

**Family**:

* Papyrus Gaster *(Brother)*,
* J.A River *(Mother)*,
* Wingding Gaster *(Father)*,
* Semi Sheriffs aka Grandpa Semi *(grandfather, is a scraped Character in Undertale but is canon here)*,
* Sariel *(biological Daughter),*
* Jazzmine Dreemurr (mother in law)
* Frisk and MK (Step Children),
* Fredrick River *(never seen but mentioned Uncle, Mother's side),*
* Casteller River *(cousin, only mentioned, OG Oc by Sylphs, easter egg)*

**Other Relationships**:

* Alphys (underlying, apprentice, he acted as a father figure towards and adventual Nemesis)
* Napstabot/Napstablook (is described by Sans as "My(his) teenaged son who is actually in their 30s),
* Private (trusted friend, and fellow guard),
* Myrtle (mentor, Trainer, former boss),
* Undyne (acted as role model to her),
* Gretchen (temporary Lab Partner),
* Grillby (Friend/Ally),
* Chara (hates her),
* Andrew (victim),
* Royal Guard (employees)

## **general personality traits**:

selfless, Grumpy, dull, Straightforward, introvert, family orientated, brave, depressed, intelligent, shy, loyal, tough, strategic, loving towards the ones he cares about, faithful to his lover, disciplined, anti-social, serious and morbid.

He is very tough and stoic because either he's in a bad mood or because of his Autism (He swapped with Papyrus so now Sans is the autistic one), he may come off to be irritable and apathetic but really he is just mentally ill and actually very mature, selfless, dedicated and fatherly.

he only shows a happy excitable immature nature when either having a manic bipolar episode, have taken his medications, around ones he cares about or in possession of his hype fixation/autistic obsessions (spinning tops, science, gears, cats, and jokingly My Little pony but it is not actually canon)

## **Main but not all powers and abilities**:

Teleportation *(he can teleport near the speed of light*), limitless Telekinesis, light-speed reaction time *(can dodge gun shot at a 1in range),* River Rivets *(Gaster Blasters),* shadow shifting, fog generation, object summoning, mid air suspension, natural determination levels, this makes his states increase by 5% each minute in battle, minor telepathy, high Stamata, weapon mastery, minor future probability cognition, master level hacking, science understanding and able to do complex math in seconds, super genius intelligence, Willpower, super human strength*(can lift a whole building and uproot a tree and hurl it out of sight),*  super sonic hearing, enhanced and night vision, super human reaction time, enhanced speed*(can run up to 45 miles per hour normally and in phoenix form he can run up to 170 miles per hour*) and 4th wall awareness

**immunities:** poisoning, lava, fire, heat, cold, pain, fall damage, seduction, blast force, blunt force with armor, mind manipulation, possession

**resistance**: dark magic, negativity acts, blunt force, cuts, magic attacks, physical attacks

**weaknesses**: light magic, healing magic, pure spells, loud noises, bright lights, social situations, his own mental illness *(monster variants of mild-moderate autism, anger issues, PTSD, Bipolar, and depression to name some)* color blindness and blood loss

**fears:** Trusting others, tongues, cockroaches, intimacy, and being the villian

## **Bio:**

SW!Fallenswap Sans C. Gaster was created in 1923 when his parents where sparing and the magic collided and formed into a physically 4 year old skeleton (Sans), at some point when he was 2 he got his bandana which is actually a piece of scrap fabric, he didn’t not start talking until he was 4 and did not fully start to talk fluently until he was 15, though he had a understanding of language and could read very well.

when he was 5 he started to refuse treatment, unopened pill bottles can be found in his room in pacifist. Sans was abused and heavily bullied as a young child to a point of causing PTSD and permanent scars, which unlike Papyrus who was very much loved, despite this, Papyrus always stayed by Sans’ side and always choose him over his friends. Sans eventually decided to go into hiding after his mother died and the kids broke off his leg (which now he wears a prosthetic) during his teenage years he has seen but have not interacted with the integrity soul.

Sans eventually leaves his house after 40+ years of hiding when a teenage Muffet breaks his window, when the monsters have seen Sans they ran away in terror because apparently he was made into some sort of folk tale of the guy who kills people in the middle of the night and what not.

Sans does unwillingly join the guard after Papyrus enrolled him so the underground could be more comfortable around him, (Sans actually wanted to be an engineer which he does in post-pacifist). Sans meets Toriel and she falls in love with him, then does confess her love to him and he accepts, the two then eventually get in a relationship but during this he loses the bottom portion of his lower left arm in a surprise ambush attack. During his time in the guard he also meets a child version of Alphys, Undyne and Napstablook/Nappstabot and becomes a adult figure to them, though out his time in the guard he encountered, in order, Patience, Bravery, Kindness, Justice, Perveance and Love (Chara) he spared Kindness, Justice and Love(Chara), but the others were brutally killed by him, which he holds guilt for.

in around 2012 Toriel proposes to Sans and he accepts. in 2015, Sariel Arrus Gaster was created and a few months later Chara Falls down and does an almost pacifist route, but like how Frisk did in Horrortale, she kills Toriel and takes her soul. Sans becomes temporary monarch in result of this, Alphys from Frisk’s influence and jealousy of Sans not spending time with her anymore and feeling betrayed when Sans temporarily suspends her due to her from bad behavior then Alphys gets almost completely taken over by Frisk and Alphys dethrones him.

Sans does escape with Sariel and Papyrus but due to his reluctance to harm Alphys, he was greatly injured in the process, Papyrus was also injured in the attack resulting in a carder in his skull like Horrortale Sans does. Sans teleports all three of them to Snowdin but due to blood loss and the fact it takes a lot of magic to teleport others with him, he passes out eventually awakens in Muffet’s Parlor and he becomes leader of Snowdin to take back the throne from Alphys, in 2026 Andrew(Trust/the player) falls down Sans acts as an antagonist and constantly tries to kill the player (and does succeed, being the main cause of this a.us Game Overs), depending on the player’s choices his future changes from there.

Main end results are:

1. He commits suicide
2. He kills Alphys and becomes depressed from it
3. He snaps and becomes completely insane and commits murder suicide
4. He sacrifices his soul to save Frisk from the terror realm after she breaks free of her corruption and uses her soul as the final soul to break the barrier which destroys her soul and the other souls in the process
5. He kills Chara
6. He is actually happy

# Trivia

* - he cannot tell female humans from male humans and judges gender by clothing and name as he gets scolded for asking for pronouns since Papyrus is afraid that they’ll think that Sans is flirting with them.
* SW!Fallenswap will glitch if brought out of the Sariel’s world timelines, if they are copied into another timeline or Multiverse, the copy of Fallen!Sans will refer himself and others in his Au as “fake Fallen!(\*>insert name here\*<)”
* - Fallen NEVER dodges the first attack but will for the next attacks, this is to test attack damage.
* - He is the only antagonist in the AU that is not evil, granting him the title of the "Anti-Villain'
* - Fallen doesn’t say *“Mweh Heh Heh”,* he says *“ehehehheheh” or “\*unholy or insane laughter\*”*
* *-* when Fallen dusts it makes screaming quiet noises
* - he’s voice becomes distorted when messing with game files or putting on his helmet.
* - he can force a chapter to be restarted and also skip chapters and keep them from being played again
* *-* Fallen has a weird fascination of human blood and collects body parts to study on.
* - the Gaster residence house’s fridge is filled with various animal parts and reeks of formaldehyde. there is also the head of the patience soul in the freezer and in Fallen’s lab he has the Kindness soul in a freezing capsule that makes them seem like they are just sleeping, judging by the books of necromancy and biology it’s possible Fallen is trying to resurrect the kindness soul.
* the necromancy books is one of the hints to Fallen possibly being half- lich.
* - Fallen loves to make snarky comebacks and witty remarks

* - Fallen’s Main Catchphrase is “BadoshKey!”
* - Fallen body is very much damaged, he is covered in scars and cuts most are self inflicted, and his rib cage is almost totally broken and deeply burnt by light magic but it’s held together by duct tape, glue and Determination
* - Fallen can teleport outside the barrier though he hates the sun and scared someone causing them to fall to their death so he’s not going to do that again.
* - He **RARELY** smiles, before he lost the ability to feel physical pain, it brought him excruciating pain to smile after he lost it it only brings mental, spiritual and emotional pain to him, the second reason he doesn’t smile is because he doesn’t express his emotion often and usually has his face in a static facial expression, which can vary from looking clueless, bored, neutral, loss in space, surprised or irritated but it doesn’t correlate with his actual emotion
* - his eye socket pupil color is a dark navy blue, though it will turn white when feeling certain emotions and get lighter in color when he is happy, instead of being able to go starry eyes (which he is capable of but even with his loss of the ability to feel physical pain it still makes him feel unbearable pain and he will only rarely do it when he is being sarcastic) his eye socket pupils dilate change color to a sky blue and have eye shines in shape of puzzle pieces, though it’s hard to make Fallen happy enough for him to do it.
* - Fallen has yellow-green color blindness
* - despite his association with blue, his favorite color is purple
* - he made working/stable artificial determination using his own blood, he also aided Gretchen to help make the artificial soul.
* - despite his disabilities, lack of social understanding and inability to care for himself, he is easily or close to being the smartest AU Sans and capable of beating enemies who are much stronger than him due to his high intelligence and fighting skills.
* - he has an Undying form which is called his Phoenix form, in which he is much stronger than undertale Undyne the Undying
* - despite his soul being unstable and slowly dying, it will persist after death but will explode if the determination is extracted from it.
* - his soul will reform to a fully intact state in his phoenix form granting him to having the full magical capabilities.
* - all his powers are increase in phoenix form
* - due to games code it’s impossible to kill him without hacking the game files, if you do hack the files, he will make a remark about it then proceeds into scolding the player and saying he can easily keep going but he’s not gonna reward you with some Easter egg fight
* - Fallen was able to hack a government database according to some dialog

* Fallen created a super computer that can directly connect to his AU's Game Files, according to genocide dialog

- He is playable in some portions of gameplay, and will talk to the player and criticize there choices or actions, and make remarks on things they tell him to do and will occasionally flat out refuse.

- Fallen supposedly can access the cheat consul and mess around with the files though he only does this after repeated Genocide routes or to jump scare the player.

- he is one of the only self aware character in Fallenswap and occasionally making very hopeless and pessimistic comments about his existence, aware of resets, which unlike Undertale Sans, he is able to fully recall all resets and give detailed descriptions of past timelines, making references to real life, talking to the narrator, winking at the camera, going off on tangents of his awareness, makes comments about being copyrighted if he or someone else uses a trademarked name and he also separates Andrew from the player, and so on

- he makes references to real life events and franchisees though rarely mentions them by name.

- He uncanonly has a close connection with Asy and Horror and considers Sci an ally.

- Fallen ***might*** know Paper Crane from a ambiguous dialog referring to "a glitching white AU Sans guy" though this could be Aftertale Sans but this is unlikely

- he only refers very few au characters by their actual au names, calling the characters he doesn’t respect or like by nicknames regarding appearance

- in his room, a pill bottle with red dopamine pills can be found, this is a Fran Bow reference

- Fallen Idolizes The Grim Reaper, calling Grim the most powerful monster ever, and even has his autograph and a shrine in his closet

- Fallen hates a lot more things than he likes

- Fallen knows Baba Yaga, and her apparent phone number can be found on his desk.

- Fallen plays the guitar and piano

- Fallen’s mental illness is untreated unlike Papyrus’ ADHD and Narcolepsy is.

- Fallen is a misanthrope.

- Fallen lacks a sense of smell, taste and touch but he has very much enhanced super sonic hearing and eye sight.

- Fallen hates chocolate because it makes his daughter Sariel sick since she is half boss monster, he also hates it because Chara likes it.

- Fallen carries around lollipops to give to children

- Fallen is the one who made the portal that made him enter the anti-void and made the return pad to return to his au, though it was his brother who set it off

       - He eventually uses a transdimensional dagger to travel around the multiverse

- he is glad he is not in the underverse series because he doesn’t want to deal with their quote on qoute “Dramatic Bullsh\*\*”

- his au is known to be very negative and to be able to drive people outside his AU insane from being in there even if it was only for 3 minutes, it’s also lets the soulless to feel but it only grants negative emotions.

- it’s said the negativity levels go down by 30% when Sans leaves but this is most likely a joke and/or exaggeration by Papyrus view on Sans’ behavior.

- Fallen is afraid of fanon blueberry and considers him offensive

- Fallen and Temmie both judge the Player's/Andrew's actions, Temmie does this in multiple points in the game and Sans does it at the end of the game.