List your Undertale Headcannons here!

[Clockwork Brain]

I'm suprised nobody else has done this already.
I'll start:

1. Papyrus likes puns, he just dislikes bone puns because, as a skeleton, he's heard them all countless times before.
   
2. Sans is a munchkin (a term from tabletop RPG gaming, also known as "min-maxers") who gave himself weak stats in order to have Karma magic and dodging abilities.
   
3. Sans actually CANNOT remember resets, but instead uses batman-level detective skills to piece together whether or not it's the first time around. (think about it, if he could really remember resets, then why would he continue to use the exact same sequence of attack patterns across multiple CONTINUEs? If he truely remembered resets, his battle would be pretty much impossible, with him changing up his patterns and having more randomized patterns)
   
4. W.D.Gaster is mostly scattered amongst the game's external files, with only a few bits and pieces of him that are actually in the game itself.
   
5. Sans and Papyrus come from another world, which is why they have abilities none of the other monsters have (dodging, Laser canons (which is only shared by omega flowey and Asriel Dreemur, both of which have god-level powers) KR, seeing through phone calls, shortcuts, flight, exc.)
   
6. Papyrus is actually just as smart as Sans, making the invisible electricity maze himself, he just has a different way of thinking than most people, similar to a person with Autism.
   
7. Papyrus installed the locks on the capture zone backwards as a safeguard against a human pulling the old "lock the guard in the cell" trick.
   
8. The reason Papyrus doesn't kill you in his boss fight is because he knows that killing you is pointless.
   
9. Papyrus actually did expect you to attack them in Genocide; what he didn't expect was to be one-shot by you. (after all, he is very great, and the average monster in snowdin takes multiple hits to kill). He was planning on tanking the damage before blasting you to pieces with his Special Attack. (kind of like how that TF2 veteran complaining in chat about random crits planned on tanking that shotgun before blasting the soldier to pieces) Unfortunately for Papyrus, he did not know that sparing the human allows them to one-shot you.
   
10. the Annoying Dog is the most worshipped diety in the undertale world, much like how the Christian/Jewish God is in ours.
    
11. Toriel didn't leave for the ruins until after the first soul was taken. There was actually a lot of debate between the two about what to do with the fallen human. Both Toriel and Asgore had hoped that by the time a human fell, everyone would have forgotten about Asgores declaration of war.
    
12. Undyne lost her eye to the SOUL of justice when she was a Monster Kid following Gerson around.
    
13. Each of the fallen humans had the ability to RESET, but because none of them could get past the barrier, they eventually stopped coming back, like how you haven't ♥♥♥♥♥♥ back to playing that one game because you kept getting stuck at that one part.
    
14. there are 6 characters with one of 3 different types of meta-knowledge. Toriel and Papyrus are aware of the controls ("press Z to read signs!" and "PRESS "UP" TO JUMP!"), Asgore and Sans are aware of the battle mechanics (Agore smashing the mercy button, Sans moving out of the way of your attacks) and Flowey and Gaster are aware of resets (Flowey is obvious, but Gaster's is more of an assumption based on him being scattered across time and space, which arguably renders him immune to resets, especially if headcannon #4 is correct.)

Ok, those are my headcanons, what about yours?

[Mask]

1. The annoying dog represents Toby Fox and is actually the "god" of the game world.
2. Chara is neither the evil side of Frisk nor a demon that forces you to commit genocide. She accompanies and advises you in the form of text boxes in fights and on the upper world. At the end of the genocide, it destroys the rest of the world because the "player" has already destroyed everything else (see the video "The True Villian in Undertale" for more details).
3. The player does not play the role of Frisk but is more than a "Puppetmaster" to see, which decides the fate of the world and Frisk more or less leads (for this reason, the player is often addressed directly).
4. If in a boss fight the soul of Frisk gets a different color, it represents the color of the soul of the child that failed on that boss. For this reason, MOST fitting to the souls are the children's items.
5. Gaster was the scientist who worked long before Alphys for the king. In an experiment with the help of a machine that removes determination (true lab), Gaster almost destroyed his complete existence in the space-time-contingent. No one can remember his existence except for the "Gaster Follower".
6. Sans is actually Ness from the Earthbound Romhack that Toby Fox had created years before the Undertale apparition.
7. Generally, the Underground exists in the world of Earthbound. This can best be seen from the Horinzont seen at the end of the True Pacifist when comparing the location of the visible locations with the map from Earthbound. There is even Mount Ebott on this map (just without a name or the possibility to enter it).

[(Edgy) Asriel Dreemurr]

6: Can’t be true as Undyne has never seen a human before.

[Soundless1997]

İlk olarak (Edgy) Asriel Dreemurr tarafından gönderildi:

6: Can’t be true as Undyne has never seen a human before.

Actually, I think she has since one of her quotes in battle states that no human has ever made it past Asgore. I believe the purple soul was killed by her since their belongings are found in Waterfall. I'm definitely sure she never met the blue soul since she said in one phone call that she has no idea who is the owner of the ballet shoes. The green soul's stuff is found in Hotland, meaning they did got past Undyne. As for the yellow soul, I believe they did reach New Home, but lost to Asgore. So Undyne has met at most three humans before meeting Frisk.

[CrowRising]

My headcanon is that ghosts and humans both don't have gender in the Undertale universe, and are whatever they feel like being at the moment.

[HumanPersonMan]

1. Each human who fell down underground was like a player, with the power to reset. They thought the game was too heccin hard so they gave up on the "Game". Or Maybe Chara possesed every human who fell down so far, like how Frisk was, but they didn't have enough power to get anywhere.
2. Toriel still cares for Asgore but just feels wrong trying to, so she acts like she hates him.
3. For Ps4/Switch owners, Froggit talks about there not being a frog border. There was, but Toby copy/pasted a dog over it.
4. Mettaton is "Happstablook" Because it is also Papyrus' Headcannon and he is an immortal.
5. Papyrus wouldn't have been so naive if Sans didn't sheild him from the world and solve his problems for him.
6. Undyne and Asgore have weekly tea parties.
7. When annoying dog takes things, like Papyrus' special attack or the artifact, it's actually Toby realising that the player isn't ready for those secrets and might show them off somewhere else.
8. Alphys built Mad mew mew for fun because she felt disconnected from Mettaton.
9. Oof.
10. Asgore also knows about resetting, determination very well, like Sans and Flowey, because he looks sadder every time you die during the fight (Talk to him after you die a certain amount of times.)
11. Sans wouldn't really want to kill you if there was no promise, he just wanted to scare you out of the genocide run.

[Casual Amateur]

İlk olarak Soundless1997 tarafından gönderildi:

İlk olarak (Edgy) Asriel Dreemurr tarafından gönderildi:

6: Can’t be true as Undyne has never seen a human before.

Actually, I think she has since one of her quotes in battle states that no human has ever made it past Asgore. I believe the purple soul was killed by her since their belongings are found in Waterfall. I'm definitely sure she never met the blue soul since she said in one phone call that she has no idea who is the owner of the ballet shoes. The green soul's stuff is found in Hotland, meaning they did got past Undyne. As for the yellow soul, I believe they did reach New Home, but lost to Asgore. So Undyne has met at most three humans before meeting Frisk.

That kinda embarrassing for (Edgy) Asriel Dreemurr thought.

[Smithsiblings4]

I have a few

1. Sans has determination, and his lazyness keeps him from melting with it.

2. Frisk fell into the underground on purpose after hearing rumors that there were still some monsters left. he/she wanted to murder them all

3. Gaster is not Sans and Papyrus' dad

4. Determination works like this: when humans load a save point, the timeline in which they died still exists, but without them, while they create a new timeline in which they didn't die

5. Asgore is lazier than Sans because he could have crossed the barrier with 1 human soul, then gather the other 6 and break the barrier, but he just waited incase 7 humans fell into the underground because he was just too lazy.

6. Sans battle dialogue, in wich he talks about him and someone else studying timelines refers to him and Gaster, before Gaster's death.

7. Sans can see through the resets because he has determination.

8. when Flowey talks to you, he isn't talking to the player, he's talking to Chara

these are all 100% serious headcanons of mine, and I honestly don't care wether you agree or disagree with them

[(Edgy) Asriel Dreemurr]

İlk olarak blowheaded tarafından gönderildi:

İlk olarak Soundless1997 tarafından gönderildi:

Actually, I think she has since one of her quotes in battle states that no human has ever made it past Asgore. I believe the purple soul was killed by her since their belongings are found in Waterfall. I'm definitely sure she never met the blue soul since she said in one phone call that she has no idea who is the owner of the ballet shoes. The green soul's stuff is found in Hotland, meaning they did got past Undyne. As for the yellow soul, I believe they did reach New Home, but lost to Asgore. So Undyne has met at most three humans before meeting Frisk.

That kinda embarrassing for (Edgy) Asriel Dreemurr thought.

Not really. If you have to pass Papyrus to get to Undyne, and Papyrus has never seen a human. That would mean Undyne has never seen one either. Asgore is immortal. Just because Undyne says that a human hasn’t ♥♥♥♥♥♥ past Asgore doesn’t mean it happened in her lifetime. She would know all the stuff Alphys told her about humans wasn’t true if she’d seen several before Frisk.

Also her line “Alphys told me humans were determined. I see now what she meant by that.”
Implies this is the first time she’s fought a human.

[Casual Amateur]

İlk olarak (Edgy) Asriel Dreemurr tarafından gönderildi:

İlk olarak blowheaded tarafından gönderildi:

That kinda embarrassing for (Edgy) Asriel Dreemurr thought.

Not really. If you have to pass Papyrus to get to Undyne, and Papyrus has never seen a human. That would mean Undyne has never seen one either. Asgore is immortal. Just because Undyne says that a human hasn’t ♥♥♥♥♥♥ past Asgore doesn’t mean it happened in her lifetime. She would know all the stuff Alphys told her about humans wasn’t true if she’d seen several before Frisk.

Also her line “Alphys told me humans were determined. I see now what she meant by that.”
Implies this is the first time she’s fought a human.

Still it pretty what think it would happen in your personal mind of your. It pretty much you can't call it true or false you know. It is the same as people want to think about Frisk gender on boy, girl, and genderless. It never talk about it in game. Also you make mistake on Asgore. He is not a immortal. He can still die.

[(Edgy) Asriel Dreemurr]

İlk olarak blowheaded tarafından gönderildi:

İlk olarak (Edgy) Asriel Dreemurr tarafından gönderildi:

Not really. If you have to pass Papyrus to get to Undyne, and Papyrus has never seen a human. That would mean Undyne has never seen one either. Asgore is immortal. Just because Undyne says that a human hasn’t ♥♥♥♥♥♥ past Asgore doesn’t mean it happened in her lifetime. She would know all the stuff Alphys told her about humans wasn’t true if she’d seen several before Frisk.

Also her line “Alphys told me humans were determined. I see now what she meant by that.”
Implies this is the first time she’s fought a human.

Still it pretty what think it would happen in your personal mind of your. It pretty much you can't call it true or false you know. It is the same as people want to think about Frisk gender on boy, girl, and genderless. It never talk about it in game.

But it wouldn’t make sense for Undyne to say that if she had fought a human in the past.

And no, it is different from the gender thing. Frisk’s gender is intentionally left ambiguous because it doesn’t matter what gender they are, it would have no effect on the overall story or its backstory. So you can leave that for the audience to decide so the player can connect with their character however they want. Building your character’s own backstory if not specified is where you can have this sort of freedom.

Knowing whether or not Undyne has seen or fought a human however does have implications on Undyne’s character and on the game’s timeline. The order of events of a world that lead up to your inclusion in the story is not something that should be left for the player to decide. It’s a difference of whether 10s to 1000s of years have passed between Chara and Frisk falling into the Underground.

[Casual Amateur]

İlk olarak (Edgy) Asriel Dreemurr tarafından gönderildi:

İlk olarak blowheaded tarafından gönderildi:

Still it pretty what think it would happen in your personal mind of your. It pretty much you can't call it true or false you know. It is the same as people want to think about Frisk gender on boy, girl, and genderless. It never talk about it in game.

But it wouldn’t make sense for Undyne to say that if she had fought a human in the past.

And no, it is different from the gender thing. Frisk’s gender is intentionally left ambiguous because it doesn’t matter what gender they are, it would have no effect on the overall story or its backstory. So you can leave that for the audience to decide so the player can connect with their character however they want. Building your character’s own backstory if not specified is where you can have this sort of freedom.

Knowing whether or not Undyne has seen or fought a human however does have implications on Undyne’s character and on the game’s timeline. The order of events of a world that lead up to your inclusion in the story is not something that should be left for the player to decide. It’s a difference of whether 10s to 1000s of years have passed between Chara and Frisk falling into the Underground.

Still it is your personal thought to think it is wouldn’t make sense. It is just you want to think her never meet them in the first place. It pretty much you want to people to think it is true any way and think other person is wrong.

[Soundless1997]

İlk olarak (Edgy) Asriel Dreemurr tarafından gönderildi:

İlk olarak blowheaded tarafından gönderildi:

That kinda embarrassing for (Edgy) Asriel Dreemurr thought.

Not really. If you have to pass Papyrus to get to Undyne, and Papyrus has never seen a human. That would mean Undyne has never seen one either. Asgore is immortal. Just because Undyne says that a human hasn’t ♥♥♥♥♥♥ past Asgore doesn’t mean it happened in her lifetime. She would know all the stuff Alphys told her about humans wasn’t true if she’d seen several before Frisk.

Also her line “Alphys told me humans were determined. I see now what she meant by that.”
Implies this is the first time she’s fought a human.

That doesn't exactly mean that Sans and Papyrus moved into Snowdin during the slaughter of the six other humans. It's very possible that after the yellow soul died, they moved in and Papyrus starts to fulfill his dream of joining the royal guard by attempting to capture Frisk. Plus, Frisk is the only one who is able to get Alphys to tell Undyne the truth about her "human history books" since they alone can't convince Undyne that humans really don't wield giant swords up to 10x their size.

[(Edgy) Asriel Dreemurr]

İlk olarak blowheaded tarafından gönderildi:

İlk olarak (Edgy) Asriel Dreemurr tarafından gönderildi:

But it wouldn’t make sense for Undyne to say that if she had fought a human in the past.

And no, it is different from the gender thing. Frisk’s gender is intentionally left ambiguous because it doesn’t matter what gender they are, it would have no effect on the overall story or its backstory. So you can leave that for the audience to decide so the player can connect with their character however they want. Building your character’s own backstory if not specified is where you can have this sort of freedom.

Knowing whether or not Undyne has seen or fought a human however does have implications on Undyne’s character and on the game’s timeline. The order of events of a world that lead up to your inclusion in the story is not something that should be left for the player to decide. It’s a difference of whether 10s to 1000s of years have passed between Chara and Frisk falling into the Underground.

Still it is your personal thought to think it is wouldn’t make sense. It is just you want to think her never meet them in the first place. It pretty much you want to people to think it is true any way and think other person is wrong.

It’s not my own personal thought. If Undyne had fought another human previously she would both know how resilient they would be, meaning she wouldn’t have a reason to essentially say “I didn’t know humans were this tough”, and she would also know that none of the stuff Alphys told her was true, because she would see it by looking at the human.

[(Edgy) Asriel Dreemurr]

İlk olarak Soundless1997 tarafından gönderildi:

İlk olarak (Edgy) Asriel Dreemurr tarafından gönderildi:

Not really. If you have to pass Papyrus to get to Undyne, and Papyrus has never seen a human. That would mean Undyne has never seen one either. Asgore is immortal. Just because Undyne says that a human hasn’t ♥♥♥♥♥♥ past Asgore doesn’t mean it happened in her lifetime. She would know all the stuff Alphys told her about humans wasn’t true if she’d seen several before Frisk.

Also her line “Alphys told me humans were determined. I see now what she meant by that.”
Implies this is the first time she’s fought a human.

That doesn't exactly mean that Sans and Papyrus moved into Snowdin during the slaughter of the six other humans. It's very possible that after the yellow soul died, they moved in and Papyrus starts to fulfill his dream of joining the royal guard by attempting to capture Frisk. Plus, Frisk is the only one who is able to get Alphys to tell Undyne the truth about her "human history books" since they alone can't convince Undyne that humans really don't wield giant swords up to 10x their size.

I’m saying the human that fell into the Underground right before Frisk did so before most of the characters in the game were born. This is because no one except Gerson and the Dreemurrs acknowledge ever seeing a human before, they all act as if either they don’t know what a human is, or Frisk is the first human they’ve seen. The Dreemurrs are also explicitly stated to be immortal due to Asriel’s death, and Gerson was also alive during the initial war.

[Clockwork Brain]

İlk olarak (Edgy) Asriel Dreemurr tarafından gönderildi:

İlk olarak Soundless1997 tarafından gönderildi:

That doesn't exactly mean that Sans and Papyrus moved into Snowdin during the slaughter of the six other humans. It's very possible that after the yellow soul died, they moved in and Papyrus starts to fulfill his dream of joining the royal guard by attempting to capture Frisk. Plus, Frisk is the only one who is able to get Alphys to tell Undyne the truth about her "human history books" since they alone can't convince Undyne that humans really don't wield giant swords up to 10x their size.

I’m saying the human that fell into the Underground right before Frisk did so before most of the characters in the game were born. This is because no one except Gerson and the Dreemurrs acknowledge ever seeing a human before, they all act as if either they don’t know what a human is, or Frisk is the first human they’ve seen. The Dreemurrs are also explicitly stated to be immortal due to Asriel’s death, and Gerson was also alive during the initial war.

this is supported by Toriel's statement at the beginning of the game "you are the first human to fall down in a long time"
also realized I forgot several headcannons, updated my list.