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Code2000 — Undertale Headcanons
Published: 2016-01-04 01:38:40 +0000 UTC; Views: 18274; Favourites: 149; Downloads: 0
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Sans
Hugs: blushes a bit but smiles and complies
Cheek kiss: blushes and looks away
Belly kiss: this will absolutely make him MELT
Neck kiss: he giggles because it tickles him a bit
Kiss on the lips: smirks and kisses back
Tickles: has a deep belly laugh and secretly enjoys the attention
Being complimented: blushes and quietly thanks the person
Being dominant: is very quick to change plans in order to keep his partner wondering
Being submissive: loves for things to be nice and deep
Cuddles: is fine with it, but will get embarrassed if the other person nuzzles him in any way shape or form
Soul touching: blushes, trembles and whimpers. This can turn him from dominant to submissive in seconds.
Papyrus
Hugs: loves hugs and practically lives for them
Cheek kiss: blushes and hides his face
Belly kiss: giggles and curls up
Neck kiss: whimpers and freezes up
Kiss on the lips: awkwardly kisses back
Tickles: dreads tickle talk like you wouldn't believe. He also has really bad after tickles. It will be like 15 minutes later and he is still giggling that sweet little cinnamon roll ahhhhhhh
Being complimented: blushes and acts like well of course I am
Being dominant: is shy and tries to make the other person happy
Being submissive: gets embarrassed really easily
Cuddles: loves it and will GLADLY partake in it
Soul touching: turns shy and looks away, a small orange blush forming on his face
Mettaton
Hugs: loves the occasional hug, and will do it to make people feel better
Cheek kiss: chuckles and thanks the person
Belly kiss: internally squees
Neck kiss: freakin blue screens or something
Kiss on the lips: kisses back and pulls the person closer
Tickles: has a surprisingly high-pitched laugh and hiccups a bit
Being complimented: smiles and compliments the person back
Being dominant: is very nice and gentle and will only do things that the other person is comfortable with.
Being submissive: likes things to be gentle and sweet
Cuddles: is perfectly fine until you touch the heart, which will make him putty in your hands
Soul touching: practically overloads lol he will start making all kinds of weird noises, most of which sound like desperate mewls
Grillby
Hugs: jumps and slowly hugs the person back
Cheek kiss: appears to chuckle and kisses the persons cheek too
Belly kiss: he flickers for a moment, unsure how to react
Neck kiss: the flames become darker, like he is blushing
Kiss on the lips: kisses back gently
Tickles: has a silent chuckle and creates tiny sparks. If one of the sparks hits you, it sends a tingling, ticklish, yet pleasant sensation in that area
Being complimented: nods his thanks and finds something else to do to hide his embarrassment
Being dominant: is very careful not to hurt the other person
Being submissive: lets you do whatever you want
Cuddles: is very warm and cuddly, like a nap by a fireplace
Soul touching: the flames will turn blue and he will emanate a warm aura as he curls up a bit like a lap dog XD
Napstablook
Hugs: blushes and nuzzles the person back
Cheek kiss: blushes and murmurs thanks
Belly kiss: squeaks and giggles
Neck kiss: begins to glow a bit from embarrassment
Kiss on the lips: shyly kisses back
Tickles: squirms and lets out an occasional cute little snort ahhhhhhhhh my godddddddddd
Being complimented: tries to deny it, but loves it nonetheless
Being dominant: is unsure and quiet, always focusing on the other person's pleasure
Being submissive: is very shy and sensitive about everything
Cuddles: loves it dearly, because it makes him feel warm inside and he lights up like a lantern and skcjskcjkdkcjskvkekckk I love him
Soul touching: hides his face and starts to become even more transparent to hide himself, unaware that it is showing his soul even more
Flowey
Hugs: squeaks and squirms, trying to get away so the person doesn't see him blush
Cheek kiss: growls but blushes lightly
Belly kiss: looks away and stays silent
Neck kiss: whimpers cutely
Kiss on the lips: grumbles, but kisses back reluctantly
Tickles: practically screeches, before falling into cute, contagious laughter
Being complimented: looks down and thanks the person
Being dominant: is very confident and quick
Being submissive: is shy and unsure
Cuddles: enjoys it, but won't admit it; it makes him feel loved
Soul touching: (if he had one) would freeze and tremble, unsure how to react
Gaster
Hugs: chuckles silently and hugs back gently
Cheek kiss: blushes and gasps from surprise
Belly kiss: blushes and whimpers a bit
Neck kiss: trembles and purrs a bit
Kiss on the lips: kisses back gently, smiling
Tickles: chuckles deeply and twitches back a bit
Being complimented: blushes and thanks the person in a practically non existent voice
Being dominant: is kind and gentle
Being submissive: is shy and teasing
Cuddles: loves to cuddle and holds the person close to him, humming quietly
Soul touching: (assuming he has one) blushes and smiles, sighing in a content manner
Underfell!Sans
Hugs: jumps and freezes in place
Cheek kiss: blushes and halfheartedly growls at the person
Belly kiss: trembles and makes small sighing noises
Neck kiss: purrs and relaxes a bit
Kiss on the lips: sits still, unsure of what to do
Tickles: laughs in an almost tortured manner. He is INCREDIBLY ticklish
Being complimented: grunts and looks away
Being dominant: is amazingly considerate to the other person, trying to make sure that nothing is unpleasant for them.
Being submissive: tries to hide himself due to his surprisingly low self-esteem, especially about his body
Cuddles: doesn't mind it at all, and loves it when someone sits on his lap so he can hug them close and snuggle up and ahhhhhhhhhh!
Soul touching: blushes and halfheartedly tried to make you stop but he actually likes it but he is too shy to admit it and ahhhhhhhh
Underfell!Papyrus
Hugs: flinches, but slowly hugs back
Cheek kiss: blushes and smiles a bit
Belly kiss: chuckles and curls up a bit
Neck kiss: whimpers and tenses up
Kiss on the lips: awkwardly kisses back
Tickles: chuckles quietly
Being complimented: smirks and thanks the person in an almost sarcastic manner
Being dominant: is surprisingly sweet and gentle
Being submissive: is surprisingly shy and unsure of himself
Cuddles: holds the person close possessively
Soul touching: jumps and hides his face behind his hands, attempting to hide his smile and blush
Mad Dummy
Hugs: flips out and tries to halfheartedly squirm away
Cheek kiss: blushes and stutters as he tries to insult the person
Belly kiss: jumps and panics a bit
Neck kiss: blushes and freezes
Kiss on the lips: slowly kisses back awkwardly
Tickles: thrashes about and tries (and fails) to insult them through his giggles
Being complimented: rolls his eyes and basically says of course
Being dominant: is very rough, though not on purpose. If you are really in pain or disliking it, he will stop and panic.
Being submissive: is very demanding and wants things his way. But if you do things just right, you'll shut him up real fast...~
Cuddles: is soft and cuddly like a stuffed bear, but good luck pinning him down to cuddle him LOL
Soul touching: starts flailing and whining, but won't stop you
Underswap!Sans
Hugs: hugs the person back and smiles like a goof
Cheek kiss: blushes and hides his face behind his scarf
Belly kiss: gasps and covers his mouth in fear of giggling, not wanting to sound 'weak'
Neck kiss: shivers and holds on to the person
Kiss on the lips: hugs the person gently and kisses back
Tickles: squeals and squirms around while giggling cutely
Being complimented: smiles and small stars appear in his eyes as he's like 'really?!'
Being dominant: is shy and unsure, constantly checking to make sure the other person is alright
Being submissive: is hyper sensitive and practically any touch will cause him to whimper
Cuddles: holds the person close protectively and gently, wanting them to feel safe
Soul touching: giggles a bit and blushes
Underswap!Papyrus
Hugs: hugs back slowly, blushing a bit
Cheek kiss: chuckles and kisses them back
Belly kiss: is shocked into silence, the only sign that he is still there being his blush
Neck kiss: blushes harshly and turns away
Kiss on the lips: freezes before kissing back deeply and pulling the person closer gently
Tickles: cackles and looks away from the person in embarrassment
Being complimented: shrugs and thanks the person
Being dominant: is teasing and ready to participate in someone's kinks
Being submissive: loves to be pinned down and messed with gently
Cuddles: usually lays on his back and lets the person lay on top of him, cuddling up to his chest
Soul touching: relaxes and may actually fall asleep lol
Error!Sans
Hugs: don't lol. Unless you tickle him first, he is very claustrophobic
Cheek kiss: blushes and freezes up
Belly kiss: tenses up and blushes, closing his eyes and looking away
Neck kiss: trembles and mewls submissively
Kiss on the lips: jumps and shyly kisses back gently
Tickles: Freaks. Out. Majorly. Laughs like a psychopath on a sugar high. The occasional snort and hiccup may come out. After being tickled, he likes to be held close (mostly so he can hide his face. He is pretty claustrophobic otherwise.)
Being complimented: blushes and smiles, hiding in his coat like a turtle
Being dominant: will tie up his partner and tease them mercilessly, though he won't hurt you
Being submissive: wants to be praised and cuddled, but won't say that out loud
Cuddles: same with hugging only he will treat the other person like a huge stuffed animal and may fall asleep in their arms if he trusts them
Soul touching: glitches out and blushes IMMENSELY. His soul is very sensitive.
Ink!Sans
Hugs: smiles and holds the person back gently, rubbing their back
Cheek kiss: blushes and kisses the person back while smiling teasingly
Belly kiss: gasps and blushes, looking dazed
Neck kiss: makes cute little whimpers and exposes his neck more
Kiss on the lips: gets EXTREMELY flustered, but kisses back shyly
Tickles: giggles and loves tickle talk. He doesn't give up easily; you will have to tickle him while teasing him to truly embarrass him.
Being complimented: blushes and smiles, muttering a shy thank you.
Being dominant: loves to gently trace every curve of the persons body, with an adorably curious look on his face, but once he's done with that, he turns into a teasing monster.
Being submissive: gets embarrassed if you compliment him and will buck a bit if you tease his hips
Cuddles: holds the person close gently, smiling and complimenting them, telling them how amazing, unique, and beautiful/handsome they are.
Soul touching: hums in a satisfied manner, enjoying the warmth. If you gently run your fingers across the soul, he will tremble and practically collapse into a mewling ball.
Underlust!Sans
Hugs: smirks and hugs back, gently running his fingers over the persons back
Cheek kiss: blushes a little bit and smiles genuinely
Belly kiss: gasps and blushes a bit, embarrassed
Neck kiss: moans gently and holds the person closer to him
Kiss on the lips: kisses back, licking your lips a bit to tease you
Tickles: laughs heartily, but if you keep it up long enough, he will moan a bit as well
Being complimented: chuckles and thanks the person
Being dominant: loves to leave little marks. Enough to hide, but also enough to feel it later...
Being submissive: loves to be tied up and also loves body worship
Cuddles: holds the person close and nuzzles them
Soul touching: sighs in a contented manner and blushes darkly
Underlust!Papyrus
Hugs: hugs the person back tenderly and may tickle you a little bit to make you smile such a sweetheart aaaahhhhhh
Cheek kiss: blushes madly and squeaks a bit
Belly kiss: sighs happily and makes a small purring noise
Neck kiss: shivers and moans deeply
Kiss on the lips: is a very gentle kisser, wanting you to feel safe and loved
Tickles: LOVES TO BE TICKLED. This is the quickest way to make him melt
Being complimented: hides his face in embarrassment
Being dominant: loves to leave a trail of kisses and he loves to whisper cute compliments in your ear and ahhhhh
Being submissive: loves to be praised and tickled
Cuddles: loves to have the person sit in his lap so he can cuddle and nuzzle them
Soul touching: moans and begs, blushing profusely
EDIT: 8/23/2017
Underlust!Mettaton
Hugs: he holds the other person close shyly and is very awkward about physical contact
Cheek kiss: blushes and hides his face in embarrassment
Belly kiss: squeaks and covers his mouth, confused as to why he made that noise
Neck kiss: gasps and whines cutely
Kiss on the lips: kisses back sweetly
Tickles: squeals and squeaks, squirming around and laughing
Being complimented: blushes and thanks the person, smiling
Being dominant: is unsure and very gentle
Being submissive: asks for the other person to take it slow. This is a major sign of trust from him.
Cuddles: nuzzles the other person and whispers compliments to them
Soul touching: his soul cannot exit his body, so the closest you can get is touching the container that the soul is in, which is a huge leap for him.
Adult!Asriel
Hugs: holds the person close possessively. If anyone else tries to touch you while he's hugging you, he will bite lol
Cheek kiss: blushes but then smirks and says 'you missed~' kissing the person on the lips
Belly kiss: squeaks and covers his face
Neck kiss: blushes immensely and makes a little purring noise
Kiss on the lips: jumps and cautiously kisses back, unused to the attention.
Tickles: His ears. Touch his ears and he will laugh like he was on joker gas. No joke. He will flip. He is INSANELY ticklish. (God of Hypertickles~)
Being complimented: smirks and his cheeks turn a bit pink, taking the compliment and looking all smug
Being dominant: Has no problems teasing you and being playful
Being submissive: Has no problems with any kinks really and will not hesitate to be vocal if you want him to
Cuddles: likes to nuzzle the other person with his fluffy little nose and skcjskcjkdkcjskvkekckk
Soul touching: smiles and holds the person closer to him, glad that someone loves him (*cries*)
Brassberry!Sans
Hugs: holds the person gently, as if they were made of glass
Cheek kiss: freezes at first but then smiles a bit
Belly kiss: chuckles and curls up a bit
Neck kiss: whimpers and relaxes into the person's embrace
Kiss on the lips: is a very passionate kisser, gently rubbing your back as he kisses you
Tickles: has a rather deep and sexy laugh actually. It sounds smooth and happy. He really enjoys it, but he would never admit it.
Being complimented: blushes madly and looks away, unable to respond
Being dominant: will nibble and mess with you, enjoying any kind of flustered reactions
Being submissive: loves to be teased and touched. Down for any kink honestly
Cuddles: loves the feeling of someone pressed against him and may fall asleep in your arms if he feels safe enough
Soul touching: will only do this with someone he really trusts. Believe it or not, his soul is pretty ticklish so be careful how you touch it
Underfresh!Sans
Hugs: gasps a bit, but then smiles and pulls the person closer, admiring their warmth
Cheek kiss: jumps and blushes
Belly kiss: twitches away and makes a small snorting noise
Neck kiss: moans a bit before blushing and covering his mouth, confused
Kiss on the lips: D o Y o u R e a l l y W a n t T h a t ? Seriously though, he doesn't really get it. He really likes it, but he doesn't understand the concept of love.
Tickles: start tickling him and he won't let you stop. If you start to pull away, he will pull you back and probably clear his throat or shyly ask for you to keep going. He adores the sensation, as it gives him a reason to really smile and laugh.
Being complimented: pulls his hat down a bit and mutters a shy thank you
Being dominant: loves to feel the person's body and compliment them
Being submissive: PHYSICAL CONTACT IS HIS WEAKNESS. Touch him in any way in any place and he melts. He will turn into an adorable flustered mess
Cuddles: adores having someone sit in his lap. Be warned though, he may try and tickle you to make you squeak, mostly because he enjoys seeing the person get all embarrassed
Soul touching: whimpers and tries to hold the person for comfort and to hide his embarrassment
Horrortale!Sans
Hugs: twitches and hugs back, touching the person's neck
Cheek kiss: growls a bit
Belly kiss: jumps back
Neck kiss: shudders and freezes in shock
Kiss on the lips: kisses back hungrily with a smirk
Tickles: he gets more embarrassed than anyone ever. Bar none. His ribs are a major tickling hotspot. Trail a feather over it, barely touching him? He laughs so hard he is actually crying, tears literally streaming down his face. More out of embarrassment then ticklishness, but still.
Being complimented: eye narrows and he thinks you're taking advantage of him
Being dominant: is very rough, but will take care of you afterwards
Being submissive: good luck. If you pull it off, his skull is a sensitive sweet spot.
Cuddles: isn't used to it because the smell of blood is generally something people want to avoid
Soul touching: his soul is very weak and sensitive, but if you're gentle, he'll turn to jello
Horrortale!Papyrus
Hugs: hugs back happily, probably crushing your spine tbh
Cheek kiss: giggles and nuzzles your cheek back
Belly kiss: practically screeches and runs away
Neck kiss: makes a hissing noise, but doesn't move
Kiss on the lips: freezes like a statue and doesn't know how to react
Tickles: falls over and laughs like a goof. It will definitely make him less scary.
Being complimented: laughs maniacally
Being dominant: loves to bite and leave marks
Being submissive: his spine is very sensitive, so be careful with that
Cuddles: treats you like a porcelain doll
Soul touching: curls up and practically becomes a puppy
Related content
Comments: 173
I like, you should do these for more fandoms lol
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my favorite part is Horror Sans at the soul touching part, he turns from Horror into Jello Sans huzza XD
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Are ya gonna add Dream! Sans and Nightmare! Sans maybe?
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I think..? idk honestly XD
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FLOWEY HAS A NECK!
SIOFJGSOGJSDGLKJIOSDGJFIJGFDOGJFIDJGDGD
THE WORLD IS A LIEEEE
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SCREW YOU, FANDOM! XD PELase don;t take this seriously.
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I now have a sudden urge to be hugged by one of the skeletons. (not US pap, though.) (most likely by one of the underlust's, of coures. 
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I have some I'm planning on adding, (quite a bit, actually) but I haven't finished yet DX soon enough though
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I most read Sans x Reader fanfictions so... Oh, and some underswap and underfell papyrus aswell.
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ok, so it was normal up until the point where FLOWEY and MAD DUMMY came in and i just couldn't stop laughing OMG
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Honestly I have no idea why I put them in here either XD
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*BREATHHHEE* EHHHH TOO KUTE-
*faints*
Michelle ; GREAT JOB AUTHOR CHAN U BROKE HER!
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Can't wait for this to be updated. And if I could make a suggestion, Frisk and Chara???
(FYI, Chara isn't as evil as you think, just has a lot of issues. Tends to hide his depression with anger.)
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Yeah I have a lot of characters to add XD and everytime I'm about to post it I think of like 10 more characters lol
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OMG!! Underswap Sans, Underswap Papyrus, and Napstablook are my favorites!!
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Could you do aftertale sans and Underfresh sans? And maybe even Sciencetale sans?
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Yus. I must do them all XD
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underlust is like underTAIL. Its mostly contains of porn, sexual act, and kinks
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Thank you, Now, I'm fairly traumitzed....
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*shrugs* Fanbase decides i guess XD
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I was wondering the same exact thing... Maybe it's different, but still along the lines...? Like a deeper connection to one monster to the other..? Eh.. Worth looking into
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This makes me wonder what your Geno and Fresh headcannons are. (both by same as Error if u didnt know)
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I would love it if you could do n InkSans x Reader!!!
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OH MY GOD!!! I WAS BLUSHING THROUGH ALL OF THIS!!! *still blushing, attempting to hide her face from the guys*
The Flowey, Papyrus, and Mettaton ones were my favorites
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AAAAAHH I NEED LIKE 12000000 OF EVERY SANS YOU GOT PLZ
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I usually hate undertale sin BUT UNDERLUST PAP IS WHAT I LIVE FOR
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If I may suggest, Storyshift Sans and Papyrus?
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Ooooooo I might have to do that soon O.O
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(Since you know about Ink Sans, I'm assuming you know the creator, Comyet.) Recently Comyet released 3 new outcode Sanses, Temperate, Holiday, and Heats. I would love to see some headcanons for them when you get to it 
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Ooooo I didn't know about these new sanses! I'll look at it and come up with some
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Sweet, thank you! Looking forward to it
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Okay! It has been updated! If you have specific requests for what or who I should add, please let me know! Love you all.
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Maaaaaaybe both genders for Frisk and Chara? (Juuuuuuuust a suggestion ^u^')
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:3 I will definitely see what i can do
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oi!! If you're willing, could you add Undyne and Alphys? I love them so much ^^ (buuuttt I love Sans more ^^ smoochhh)
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MY BABIES- *ahem* yes i believe that can be arranged
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1)You forgot the 'kiss on the lips' for Ink and Underlust Papyrus and Sans.
2)Also maybe add on a 'make out' kind thing?
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ooooo thank you for pointing that out. something seemed off about it. and i will definitely consider it
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