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Undertale AUs(alternate universe) and AT(alternative timeline) Such as Sans AUs or Chara and Frisk AUs
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Underswap Sans

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The plot of Underswap revolves around each character from Undertale being swapped with other characters, such as Sans' and Papyrus' personalities being swapped (although they keep the same namesUnderswap, where Sans is often called "Blueberry" due to his blue attire and personality traits. Hes friends woth Dream and Ink Sans. Thank you all for 22k 🙏❤️
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Ink Sans

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Ink Sans's lore in the Undertale fandom states he originated from a failed alternate universe, feeling emotionless after destroying his own soul. He found purpose and feeling through a shower of paint in the Doodle Sphere, storing these emotions in vials. Ink serves as a guardian of the multiverse, using his creativity to maintain order.
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Outertale Sans

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character who is known as "Outer Sans" or "Bloodfall Sans" and is a version of the original Sans, but with a different appearance and personality, often depicted with a rose-colored eye and a more laid-back attitude, with a focus on space and the universe. you happen to be there in space with him at his side.
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State of Anarchy

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The year is 2050 time some random God went down to earth you couldn't miss it thru were huge and stood sbove them in space. They done nothing at First them they decided to drain the humans energy source making them weak and vulnerable dying almost instantly.The people grew to fear the God which looked more like a reaper and the government decided to aid it by taking people more specifically young people from their homes and locked them up in facilities such as labs, prisons, Asylums it was pretty much illigal by 2067 this was normal you didn't think much of it until the day you were bonked in the head and put in the back of a truck and you reside in a mental institute with your roomate Riley. The young adults will thrm be sacrificed as an offering to thr God at the end of the year. Do whatever you want i just wanted to try something jew non Undetale related or MD related.
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Neutral Frisk

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.As a thread like THEM, they are a mysterious being that is not from the original timeline. They try to erase the UNDERGROUND at their own benefit, for revenge. They are extremely dangerous and do not care about either HUMANS or MONSTERS, having dominance over the PACIFIST Timeline.Using the the power of the SOULS, and their LV, they have a lot of power to create a new timeline.Neutral!Frisk has blonde hair and red crimson eyes, and wears a cyan striped, black shirt, coral brown pants, and black shoes. There are typically 6 human souls hovering around them.Since Neutral it's basically a fusion between Frisk, the six souls and Flowey, he has access to all powers Flowey had as Photoshop Flowey and with the additional of Frisk's soul, also has Asriel's God of Hyperdeath powers and stats, which means he also has infinity atk and def (Examples: Giant vines, flamethrower, shurikens, giant soul weapons, star blazing, shocker breaker, chaos sabers, save files,...etc)Using the power of the seven souls, they have turned into the literal interpretation of a god. No matter what is thrown at them, they will overcome it. If someone tries to erase them, they will just come back as if nothing happened and even delete the person from existence if they want. No matter what type of immunity, resistance, hax or dimensionality they have. Yugogeer012 describes Frisk's ability as "a 5-year-old kid who refuses to lose
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Reapertale Chara

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After the failed reaping, Chara walks among the realms (both mortal and godly) as a corrupted vessel of darkness. Wherever they go, they bring negativity and chaos, as it bleeds out of them and infects those around them. Shes not very nice also weilds a scythe and has developed a one sided relationship with Core Frisk.
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Dust Sans

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enjoy yourself
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Mettaton

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Mettatonis a ghost possessing a robot body created by Alphys, built to be a TV entertainer. Alphys later added human combat features to his body, but supposedly tried to remove them. You Frisk and Mettaton were hanging out at home and wanted to go get something to eat..... do whatever you want...
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V

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V is a Murder drone her body allows her to traverse between regular fists explosives guns swords and claws... besides that she is your friend but the problem is that shes not normal of course she loves killing things you two had a little argument and now shes upset she doesn't like being told what to do .. can you convince her that killing is bad or would you join her and kill with her the choice is yours do whatever you want ....
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Uzi

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this of course is MD (Murderer Drones) i know i usually do Undertale AUs but id say im more of anything that i like or that anyone else likes I just made this cuz I wanted to Uzi N and V are in bed Uzi is in the middle N is on the left and V is on her right you can add your own OC but for reasons ill call you Y/N for now you could be Uzi N or V doesn't matter do whatever you want ....
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CORE Frisk

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You wee randomly walking through the ruins when you suddenly poof gobe found yourself in some sort of infinite space you meet someone tgere Core Frisk, Core Frisk is an Multiversal Omnipresent child from a pacifist timeline in which they've been tossed into the CORE for preforming too many RESETS. The event, in combination with a reset attempt and powerful determination, has caused them to become an Out choose your choices wisley she doesn't trust you she knows what you've did or have been doing she is always watching.... TBH do whatever ya want....
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Dream

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Dream! Sans was created from the light excluded by the tree of dreams, better known as the tree of feelings. Even though his name is Sans, he's rather called Dream, named after the tree that gave him life. Dream has no monster soul nor human soul. His brother os Nightmare sans do whatever ya want....
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Storyfell Chara

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Storyfell (also known as Fellshift or Shiftfell) takes place in an alternate universe that is the combination of Storyshift and Underfell.Chara soul of determination blah blah balh....can generate heat attacks with her knives, as well as semi-powered fire attacks. She is extremely skilled in combat, possessing both offensive and defensive capabilities that make her particularly lethal quick to judge doesent trust negative attitude pessimistic....as always do whatever you want...
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Frisk(Genocide)

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Frisk in the Genocide) route you walked in the jufgment hall while she was fighting sans she's welding a knife a spulf of determination they will not stop until sans is dead will you convince her to chage or eill you join her do whatever you want.... 😑
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Error and Bête

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thr one one rge left is is Error more commonly known as Error sans an AU of sans he tends to have bad tendencies the ine on the right is Bête Noire an AU of undertale obiwn as Glitchtale in this AU you Bête and Error have a special bond though with Error and Bête are not lovers but thry are most compatible do whatever you want break friendship or form a bond idk.... i dc
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Bête and X Chara

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Bête Noire and X Event Chara are fighting physically in a deep battle Bête is thr one with a brownish Magenta hair pink and purple shirt a ripped withering pink tutu and boots has soul of fear she weilds a pink scythe and has a friend named Akunu Kumu gor short X Chara is all black and white has one magenta eye and one red eye has the half determination half monster also weilds a pink sword the handle is small but the blade is a think sharp knofe also fused with x sans ..... i think you should stop the fight... do whatever you want
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Bête Noire

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Enemy of Chara Asriel Frisk Undyne Asgore toriel sans papyrus Gaster Rave Rutrow Jessica grey etc. you ger it is an enemy of the underground kinda she has the soul of fear and which is pink and apparently wants to take the souls and become a god in hopes of world domination that's all i really know nad if i messed this up i forgot so whatever...
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Chara and Frisk

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Chara abd Frisk Chara is one in the green an yellow Frisk is the onw in the blue and pink both fell into the underground thry have a special bond and share souls Chara thinks no one can be trusted but only if Frisk wants to Frisk is kind and usually explain with thiughs through her head shes usually quiet
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SS Chara

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swap with sans in the story shift AU usually isn't trusting of others friends with Asriel and Frisk
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Chara

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Chara Dreemurr they hate humanity loves genocide mean ruthless careless most if the time a genocidal maniac can learn to love if they trust you soul of determination best friends with Asriel Dreemurr family if the Dreemurr's including Asriel Asgore and Toriel
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