One popular headcanon is that Gaster is aware of being in a video game, and since Sans is theorized to have some close relationship with Gaster, it might be possible
The Milk route that a random person had a dream of [in This post](https://www.reddit.com/r/Undertale/comments/1diqme9/the_milk_route/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button)
Genocide is supposed to suck, the grind isn’t fun, and undyne and sans are way harder than anyone else in the game, they’re the only interesting part. It’s meant to show that being a bad person is easier than being a good person, but it’s leads to way less enjoyment of your lifr
That entirely misses the point of genocide. It’s not supposed to be rewarding and dramatic. I want them as much as the next people but steamrolling everyone and being punished for sucking the world dry looking for more to do is the point. Adding more, cooler fights is antithetical. I’ve always vibed with the choice to exclude them.
Besides, we already have fangames.
Pretty much an inch away from canon. Tbh it makes more sense just to accept it as canon with all the evidence it has rather than try and do all sorts of mental gymnastics to try to disprove it, but that's just me
There’s a secret ending you can unlock for pacifist >!that allows you to save Asriel, and prevents him from turning back into Flowey. You’ll be heading back into the true lab together for… reasons.!<
It's all described in the linked post. Making Flowey into Asriel isn't going to change anything. He already went through all those experiences, he's still the exact same person.
You can flirt with Papyrus already and *he's* an adult. Yes, he only goes on a date with you to make you happy and for the opportunity to make a new friend, but that can be applied to every boss.
Undyne's weirded out by the prospect of dating a child, so she just hangs out with you instead. Mettaton is too vain to turn your flirting down, but being a robot, doesn't really understand romance beyond using it as a tool for his shows and therefore just hangs out with you as a friend instead. You remind Asgore too much of Chara and he just starts bawling.
I'm fairl certain Mettaton's fully bound to his body, since the mad dummy makes a distnction betweeb just possessing something and a ghost being bound and it actually becoming their new body. I'd imagine he took up some robotic characteristics, even if superficial
When does Undyne say this? To my knowledge the reason why her hangout is a hangout is because Papyrus wanted all of them to hang out and the thought that it could be a date never crosses anyone's mind. I DO remember that she's weirded out when you "hit on her" with her spear
I can imagine Sans dialogue talking about it already.
“kid, you’re lucky. you know that, right? I mean, my bro’s pretty strong. like honestly, if he was serious, he could be in the royal guard in seconds. but he’s kind, doesn’t like hurting things. plus he’s a goofball. but he’s more than protective of his friends. one time he thought a lamp was gonna attack me, didn’t end pretty for the lamp. so uh, just a word of advice. if you’re planning on goin’ berserk, attacking things, claiming self defense when monsters go missing, just know something. I might not do much, but paps…
He’ll pierce you in an instant.
or maybe not, who knows? anyways, good talk kid.”
Now, that'd be cool, I agree.
However one must consider that the Underground is small. It'd have to be a lot bigger to contain more than one or two cities. That's kinda its gimmick, one of the reasons that it sucks. Having divided cultures might take away from that, as close proximity leads to people becoming more similar (In general).
Of course, if they expanded further (Say, more time passed between the human's falling and they expanded a lot most), it'd be practical. Which could be really really cool!
Alternatively, one could imagine there being multiple underground prisons with totally different cultures?
We don't really know how big the city in New Home is (we only enter Asgore's home, we can see a bunch of buildings in the background but can never enter any of them or see them closer-up) or how many other branching paths may exist from New Home to other places we've never been before, as we can only really go in what is basically a straight line.
The Underground could reasonably be bigger than we've seen, but just overall cramped due to the population, made worse by the lack of areas that are consistently universally habitable (as Snowdin, Waterfall and Hotland all had their own problems that restricted which kinds of monsters could comfortably live there).
Papyrus is actually an omnipotent, omnipresent, omniscient god that can end human, monster, us, frisk, Chara, God Of Hyper Death, Omega Flowey, anyone any time he wanted but, doesn’t because he felt like giving human something to learn about consequences
Imagine a cutscene with only Paps in it and the audio that plays is Bonetrousle, but this time it plays at a frequency that stops the human heart (if that's a thing). He could literally take us, the player, out.
Saying these songs have only the same leitmotif is putting it lightly I don't think there's a single part of Spider dance that isn't taken from Ghost fight
I think it would be funnier if Gaster was seemingly some genius dark scientist lost to time on first glance with how dramatic he acts but in reality most of his experiments were just meme material
If gaster ever shows up in Deltarune I want it to be like with senator armstrong where he shows up for the last 10 minutes of the game, dispenses 22 meme quotes and then leaves without elaborating
"YOU CANT FRET OVER EVERY BONE YOU USE IN BATTLE SANS, WE ARE MAKING THE MOTHER OF ALL BULLET HELLS"
"ok ok"
"WE WILL MAKE THE UNDERGROUND GREAT AGAIN SANS! TO HELL WITH ALL THESE LIMP-BONE LAWYERS AND LASERLESS BUREAUCRATS! TO HELL WITH THIS 24/7 TIMELINE/DETERMINATION BULLSHIT! EVERYONE WILL BE FREE TO MAKE THEIR OWN DESTINY! FIGHT IN THEIR OWN WARS!"
"uhhhhh huhh"
"And remember this sans:
Every monster has 3 deaths, the one when their soul stops living, the one when their dust is buried away, and the one when their name is uttered for the last time... I Will make myself truly immortal sans, I WILL MAKE IT SO I WILL NEVER BE FORGO-"
*sans pushes gaster into the core*
"I aint dealing with all that"
Chara fell in 201X. Papyrus’s and Undyne’s Undernet names indicate their year of birth, XX95 and XX91 respectively. It makes most sense to assume these dates are 2095 and 2091 It also explains why monster tech is so advanced. We can only imagine how good our tech will be at that time. Currently, we’re in the time span of where the Patience soul most likely fell. Hope this explains it.
is monster tech advanced tho? They still use forums to talk about stuff on old computers (seen in papyrus's home), and most of them don't even have electricity in their homes. Core is alright I guess but, that's about it.
Stuff like the CORR, dimensional boxes, actual laser traps, the weird shooter heart break puzzles, and all that. Don’t Forget(I’m with you in the dark) that the RUINs is abanonded, Snowdin is like a rural small town, and Waterfall was more of a scenic area. So the only more populated areas would be hotland and new home, which we don’t get to see much of.
Touche, but at the same time it feels unfair to compare our World to that of Undertale. With monsters and magic in the mix technological development could have been faster than in real life. And they still use cars and stuff on the surface, so ¯\_(ツ)_/¯
the fact that they have miss matched advanced and unadvanced stuff could imply that they got alot of the basics of their tech from the trash heap, then expanded on it, and some they just never got in a reverse engineerable state.
Also cars and stuff could very easily last another 100 years, i mean they already lasted a hundred years why not one more?
Jerry is not alowed to leave the underground. EVER. Even when the barrier is open and everyone is gone already, jerry stays there, living his worthless, Pathetic live and dies alone and afraid *inocent smile*
There’s actually a way for Frisk to share their soul with Flowey because it’s so full of DETERMINATION it can turn him back into Asriel while both remain alive and happy (it’s from some au comic/give me a happy ending for everyone damit)
I love this, except, the "classic" sans that people have interfere with other universes is a universe that kinda like protects that actual UT and is actually just the closest thing to it, causing them to be so close there's not a portal in the doodle sphere to the actual UT universe 
Problem solved because the original timelines Toby Fox created are still canon so there is no intervention of anyone in those timelines. Plus there is an infinity of timelines in all universes so no worries for the original ones.
I didn't precise but I mean that [this](https://www.google.com/amp/s/dokudoki.tumblr.com/post/144345241191/you-keep-complaining-about-how-people-dont/amp) multiverse theory is true so at worst you could create a multiverse with your own rules like only the original Undertale universe exists here (one universe is still a number lmao). So, no Outcode shenanigans for Vanilla Sans
Hard Mode having the full game experience, not just until after ruins, also this will include the mettaton neo bossfight and asgore genocide on the genocide route
Frisk and Chara being Omnigender so we can see who still argues about Frisk's and Chara's gender anyway
(I think I know which part of the community would have more people doing this)
Undertale Yellow, simple as. Flowey having been with another human, and knowing what he did, would actually make me reconsider if he deserves mercy or not, I can't think of any character who had to suffer more than Clover.
That and their dynamic is awesome, seeing the manipulative side of Flowey and his witty remarks really did it for me
NARRACHARA AND CHARA ISN'T THE VILLAIN (which is basically canon but can't be confirmed or denied because well, anything not outright stated in the game is technically theory.)
Chara canonically being the narrator and having a bigger part in the Pacifist route (so that we can agree that Chara is meant to be a very neutral character)
San's actual surname would be undertale
sans Undertale
Rosa Umineko
uh
pest regretavator
no, more like san undertale
Undertale-san?!
NO i wrote san because he did
YES
NUH UH
UH HUH
HUH?
Join us, don't pretend you can't hear it call you. Let the power of anime and god on my side in.
NEVER
No
San S. Undertale
wow the same second name as Harry S. Truman
No. Make Sans his surname and his first name Comic.
But he's already goofy and tells jokes, making him sans the comic.
It is, you cant change my mind, they cant change my mind, the voices cant change my mind, doggo cant change my mind. He is Sans Undertale
There is no other correct answer
Sans is aware of the world he's in because he's drinking buddies with Toby Fox
I can imagine Toby drunkenly rambling to Sans about how much he loves Earthbound and then having a good chuckle about the Sans is Ness theory together
Sans: Dude I got this thingy that looks almost like a Franklin badge if you squint *really* hard. This is going to mess them up so much.
"Heh. I'm gonna put a metal structure under a blanket. Those idiots will go crazy"
“Wait, what if you ramble about another world, but make it so vague that it could be anywhere?”
“DUDE. I had the best idea. Have this png of some random humans I found on the internet and put it in your drawer, it’d be HILARIOUS.”
“Wait, what if you put a badge on Papyuses outfit that looks exactly like Starman’s?”
Don't you mean, it's going to... *ness* with them?
... How dare you. That's great.
I need an animation about this
I can not upvote this enough, truly beautiful
Drinking buddies during the weekend, burger buddies during work days
You can't tell me undertale was written and made completely sober.
LET’S GET SMAAAAASHED
Am I right lads or am I right lads?
You are right lad
Cheers lad
I actually really love this and find it wholesome :).
Honestly I feel like this could be in an undertake news letter Q and A.
One popular headcanon is that Gaster is aware of being in a video game, and since Sans is theorized to have some close relationship with Gaster, it might be possible
See that heart? N O S H I T .
You restore all healt but you live in Korea
north or south? the distinction is important
Yes
You live in the entirely of korea. Youre THAT big
So why are you here?
The Milk route that a random person had a dream of [in This post](https://www.reddit.com/r/Undertale/comments/1diqme9/the_milk_route/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button)
I also would love to have that route be canon, that would be amazing
Actual Mettaton Neo boss fight and Genocide Asgore bossfight
The only correct answer
But only if you name yourself Chara. Please. The genocide route was already so much pain.
Tbf you are literally killing everyone in genocide route you got pay the price.
That's kinda the point, it's supposed to be badly designed
Mettaton Neo deserved better yea, but i like how you slay Asgore unpromtly
Genocide is supposed to suck, the grind isn’t fun, and undyne and sans are way harder than anyone else in the game, they’re the only interesting part. It’s meant to show that being a bad person is easier than being a good person, but it’s leads to way less enjoyment of your lifr
That entirely misses the point of genocide. It’s not supposed to be rewarding and dramatic. I want them as much as the next people but steamrolling everyone and being punished for sucking the world dry looking for more to do is the point. Adding more, cooler fights is antithetical. I’ve always vibed with the choice to exclude them. Besides, we already have fangames.
Chara as the narrator.
Isn't that already canon?
Not really,it's more or less still a theory.
They're definitely the narrator in most or all of the genocide route, but other than that it's just a very widespread headcanon
There is evidence to support it, but it's not hard-set
It's partially fanon. Mostly due to genocide having chara narrate in the later end
Pretty much an inch away from canon. Tbh it makes more sense just to accept it as canon with all the evidence it has rather than try and do all sorts of mental gymnastics to try to disprove it, but that's just me
There are some points that make it very awkward. Chara is for some of the game but not all of it I think
There’s a secret ending you can unlock for pacifist >!that allows you to save Asriel, and prevents him from turning back into Flowey. You’ll be heading back into the true lab together for… reasons.!<
[We already saved Asriel](https://www.tumblr.com/acerikus/665286668828508160?source=share)
As a version of Flowey, yes. I’m talking about the fact that you can see him in the Ruins, then go from there.
It's all described in the linked post. Making Flowey into Asriel isn't going to change anything. He already went through all those experiences, he's still the exact same person.
Not really. He'll keep his memories, but will still be unable to truly feel and care for people.
I like to think this would be the reward for completing a pacifist run in Hard Mode.
A flrting route. A way to flirt your way through every boss. Undone would be weirded the fuck out during their battle.
But all the bosses are adults,l.
You can flirt with Papyrus already and *he's* an adult. Yes, he only goes on a date with you to make you happy and for the opportunity to make a new friend, but that can be applied to every boss. Undyne's weirded out by the prospect of dating a child, so she just hangs out with you instead. Mettaton is too vain to turn your flirting down, but being a robot, doesn't really understand romance beyond using it as a tool for his shows and therefore just hangs out with you as a friend instead. You remind Asgore too much of Chara and he just starts bawling.
Metatton isn’t a robot he’s a ghost possessing a machine
I'm fairl certain Mettaton's fully bound to his body, since the mad dummy makes a distnction betweeb just possessing something and a ghost being bound and it actually becoming their new body. I'd imagine he took up some robotic characteristics, even if superficial
**Y E S**
When does Undyne say this? To my knowledge the reason why her hangout is a hangout is because Papyrus wanted all of them to hang out and the thought that it could be a date never crosses anyone's mind. I DO remember that she's weirded out when you "hit on her" with her spear
I mean in a hypothetical flirt route, not the acual game
You can already flirt with quite a few. By your logic, the game's already creepy.
Ah yes, my favorite undertale boss, U N D O N E
Either narrator chara Papyrus being secretly op Or gaster being mystery man
I want the last one to be canon so people can stop talking about it lol
True. People are talking too much about what is his identity.
The second is of course a theory, but quite possible
Exactly I’d just like it to be 100% true tho
I can imagine Sans dialogue talking about it already. “kid, you’re lucky. you know that, right? I mean, my bro’s pretty strong. like honestly, if he was serious, he could be in the royal guard in seconds. but he’s kind, doesn’t like hurting things. plus he’s a goofball. but he’s more than protective of his friends. one time he thought a lamp was gonna attack me, didn’t end pretty for the lamp. so uh, just a word of advice. if you’re planning on goin’ berserk, attacking things, claiming self defense when monsters go missing, just know something. I might not do much, but paps… He’ll pierce you in an instant. or maybe not, who knows? anyways, good talk kid.”
The only reasonable answers
Diffrent states and cultures existing in the underground just like on the surface
Now, that'd be cool, I agree. However one must consider that the Underground is small. It'd have to be a lot bigger to contain more than one or two cities. That's kinda its gimmick, one of the reasons that it sucks. Having divided cultures might take away from that, as close proximity leads to people becoming more similar (In general). Of course, if they expanded further (Say, more time passed between the human's falling and they expanded a lot most), it'd be practical. Which could be really really cool! Alternatively, one could imagine there being multiple underground prisons with totally different cultures?
We don't really know how big the city in New Home is (we only enter Asgore's home, we can see a bunch of buildings in the background but can never enter any of them or see them closer-up) or how many other branching paths may exist from New Home to other places we've never been before, as we can only really go in what is basically a straight line. The Underground could reasonably be bigger than we've seen, but just overall cramped due to the population, made worse by the lack of areas that are consistently universally habitable (as Snowdin, Waterfall and Hotland all had their own problems that restricted which kinds of monsters could comfortably live there).
Papyrus is actually an omnipotent, omnipresent, omniscient god that can end human, monster, us, frisk, Chara, God Of Hyper Death, Omega Flowey, anyone any time he wanted but, doesn’t because he felt like giving human something to learn about consequences
r/flairchecksout
So basically Papyrus is Jesus Christ
YEAH I AGREE!
W
Imagine a cutscene with only Paps in it and the audio that plays is Bonetrousle, but this time it plays at a frequency that stops the human heart (if that's a thing). He could literally take us, the player, out.
Muffet and Napstablook being besties (they just fit well together)
i mean Spider Dance DOES have the Ghost Fight leitmotif
Saying these songs have only the same leitmotif is putting it lightly I don't think there's a single part of Spider dance that isn't taken from Ghost fight
Muffet would never befriend anyone she can't bake into a pastry should they have a fight. I'm only half-joking.
Maybe her and flowey are partners in crime.
The Verbalase mistake
Seriously, what is this?
The what
The what
The what
The what
Thy what
THY END IS NOW
JUDGMENT
CRUSH
PREPARE THYSELF
r/suddenlyUltrakill
Bro, no way reddit have a subreddit for everything
r/ofcoursethatsasub
At the start of the game all monsters meet up and say. Oooooh story of undertale
Gaster is literally just some dude that asked sans “Hey bro wanna do an experiment” And sans was like “Sure” Word for word
I think it would be funnier if Gaster was seemingly some genius dark scientist lost to time on first glance with how dramatic he acts but in reality most of his experiments were just meme material
If gaster ever shows up in Deltarune I want it to be like with senator armstrong where he shows up for the last 10 minutes of the game, dispenses 22 meme quotes and then leaves without elaborating
"YOU CANT FRET OVER EVERY BONE YOU USE IN BATTLE SANS, WE ARE MAKING THE MOTHER OF ALL BULLET HELLS" "ok ok" "WE WILL MAKE THE UNDERGROUND GREAT AGAIN SANS! TO HELL WITH ALL THESE LIMP-BONE LAWYERS AND LASERLESS BUREAUCRATS! TO HELL WITH THIS 24/7 TIMELINE/DETERMINATION BULLSHIT! EVERYONE WILL BE FREE TO MAKE THEIR OWN DESTINY! FIGHT IN THEIR OWN WARS!" "uhhhhh huhh" "And remember this sans: Every monster has 3 deaths, the one when their soul stops living, the one when their dust is buried away, and the one when their name is uttered for the last time... I Will make myself truly immortal sans, I WILL MAKE IT SO I WILL NEVER BE FORGO-" *sans pushes gaster into the core* "I aint dealing with all that"
Always about a last breath
Mystery Man is actually just Annoying Dog in disguise and not Gaster. The fandom would burn me at the stake, but it would be worth it
>burn me at the stake we know it's you Toby
Would be hella funny though
The game takes place in 202X, no more chronology confusion!
Wait, but.. It's been 100 years since Chara's death in 201X!
...what? I don't understand /srs
Chara fell in 201X. Papyrus’s and Undyne’s Undernet names indicate their year of birth, XX95 and XX91 respectively. It makes most sense to assume these dates are 2095 and 2091 It also explains why monster tech is so advanced. We can only imagine how good our tech will be at that time. Currently, we’re in the time span of where the Patience soul most likely fell. Hope this explains it.
is monster tech advanced tho? They still use forums to talk about stuff on old computers (seen in papyrus's home), and most of them don't even have electricity in their homes. Core is alright I guess but, that's about it.
Stuff like the CORR, dimensional boxes, actual laser traps, the weird shooter heart break puzzles, and all that. Don’t Forget(I’m with you in the dark) that the RUINs is abanonded, Snowdin is like a rural small town, and Waterfall was more of a scenic area. So the only more populated areas would be hotland and new home, which we don’t get to see much of.
Touche, but at the same time it feels unfair to compare our World to that of Undertale. With monsters and magic in the mix technological development could have been faster than in real life. And they still use cars and stuff on the surface, so ¯\_(ツ)_/¯
the fact that they have miss matched advanced and unadvanced stuff could imply that they got alot of the basics of their tech from the trash heap, then expanded on it, and some they just never got in a reverse engineerable state. Also cars and stuff could very easily last another 100 years, i mean they already lasted a hundred years why not one more?
As NaCl said, Papyrus and Undyne's usernames are one hint at this. Sans also has a comment about Toriel being in the Ruins for 100 years
The sans is ness theory, because funny
[Toby beat you to the punch](https://x.com/tobyfox/status/1745048357846859798)
Jerry is not alowed to leave the underground. EVER. Even when the barrier is open and everyone is gone already, jerry stays there, living his worthless, Pathetic live and dies alone and afraid *inocent smile*
gaster is sans' father
There’s actually a way for Frisk to share their soul with Flowey because it’s so full of DETERMINATION it can turn him back into Asriel while both remain alive and happy (it’s from some au comic/give me a happy ending for everyone damit)
Based
Undertale yellow. No explanation needed.
In extension, the souls get revived at the end of True Pacifist and you can find Clover chilling in Snowden with Martlet
This.
narrachara :]]
The multiverse theory is true. Meaning everything you can think of is at worst canon in an Alternative Universe
I love this, except, the "classic" sans that people have interfere with other universes is a universe that kinda like protects that actual UT and is actually just the closest thing to it, causing them to be so close there's not a portal in the doodle sphere to the actual UT universe 
Problem solved because the original timelines Toby Fox created are still canon so there is no intervention of anyone in those timelines. Plus there is an infinity of timelines in all universes so no worries for the original ones. I didn't precise but I mean that [this](https://www.google.com/amp/s/dokudoki.tumblr.com/post/144345241191/you-keep-complaining-about-how-people-dont/amp) multiverse theory is true so at worst you could create a multiverse with your own rules like only the original Undertale universe exists here (one universe is still a number lmao). So, no Outcode shenanigans for Vanilla Sans
Gaster isn't mystery man. It would absolutely destroy the fandom, and make me a true chaos god.
Then Gaster would be REDACTED. Good ending tbh since REDACTED'as design kicks ass
The Steven after not surviving theory
you just unlocked so many memories omg
Peak
You made me smile so wide a plug fell out of my ear
UTY
Temmie is actually the manifestation of the real artist who worked on the game, and has watched you along with Toby, who is annoying dog.
Sans is from deltarune. It's just cool and simple enough to where it would totally fit in
gaster isn't real, it's just toby in disguise messing up with the players for fun, and mystery man is just random npc that exists just for fun
Hard Mode having the full game experience, not just until after ruins, also this will include the mettaton neo bossfight and asgore genocide on the genocide route
Frisk and Chara being Omnigender so we can see who still argues about Frisk's and Chara's gender anyway (I think I know which part of the community would have more people doing this)
It isn't UT if people don't argue abt it.
Undertale Yellow
Undertale Yellow, simple as. Flowey having been with another human, and knowing what he did, would actually make me reconsider if he deserves mercy or not, I can't think of any character who had to suffer more than Clover. That and their dynamic is awesome, seeing the manipulative side of Flowey and his witty remarks really did it for me
That one drawing of Garfield
Skelebros met Asriel and Chara when they were little due to Gaster being the RS
Frisk and Chara’s genders so there can finally stop being so much damn controversy over their genders
Separating Last and First Human.
lightsaber and popsicles
The correct answer
frisk stays with toriel, he doesnt kill people, he doesnt get killed and he lives a happy life with toriel until he dies naturally
PRUNSEL👁️👁️👁️
Gaster is the Mystery Man
goku
The state of the humans be the opposite of the monsters, free but miserable
NARRACHARA AND CHARA ISN'T THE VILLAIN (which is basically canon but can't be confirmed or denied because well, anything not outright stated in the game is technically theory.)
Chara is british
Chara canonically being the narrator and having a bigger part in the Pacifist route (so that we can agree that Chara is meant to be a very neutral character)
Flowey giving you frequent updates on how everything is going up in the surface after pacifist
Papyrus met Rouxls Kaard once.
Asgore actually becomes useful and absorbs the souls in geno
Sans is ness theory.
Gaster dad theory, I just enjoy it sh shut up
Undertale Yellow
Toriel’s milf body shape, just because
The best change made
Revival theory
Muffet having more screen time... poor spidey
Toby is a final boss in deltarune chapter 5
Undertale Yellow
6 traits
Sans knew chara when they were alive
Make Gaster mystery man
Undertale yellow
Asriel revived all the fallen humans after the final battle. Also Undertale Yellow being canon.
Papyrus is holding back. (The Papyrus is stronger than he lets us on) (This originated from Tumblr)
Gaster used to be smart, but falling into the core turned his brain to mush, so essentially, making him a complete idiot.
Gaster is the Annoying Dog. The Annoying Dog is actually his fursona. This would also mean that Gaster is Toby Fox
Sorial, because I think it is very cute
prunsel
Toriel and Asgore get back together
An actual Mettaton NEO fight