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so first im gonna explain the basic characters

frisk - patty

chara - a nevadan child, shares resemblance to patty. (their name is vadena)

flowey - henry's radio (trust me ittl make sense)

toriel - virginia

sans - hopper

papyrus/alphys at the same time? - bob (might be bobbie because i ❤ sapphics and alphdyne

undyne - joyce

mettaton - alan, its funny

asgore - victor creel

photoshop/omega flowey - mindflayer and henrys radio

hidden true lab scientist, based mostly visually off of gaster - brenner

the amalgamates - lab children 002 through 010

asriel dreemurr - henry creel

BASIC STORY

its basically undertale just with a few twists and different things, such as henry and nevada child meeting before cave incident, and disclaimer creelby isnt a romantic relationship as the characters have a more familial / friendship dynamic,

henry thinks of vadena (and therefore, patty) as a friend and kind of sibling, like how asriel thinks of chara (and therefore frisk) as a friend and somewhat sibling.

theres two versions of this au, but ill be telling the original here. (some things arent canon to undertale but then again im kind of making shit up as i go wahey.)

PRE GAME LORE:

a long time ago, a boy went missing in a cave atop a mount in hawkins, he tripped on a vine and went tumbling into the underground. this is henry (so by definition he is the first human, i suppose. he isnt really, though)

the underground is kind of like the other world in coraline, except theres nothing creepy about it, its just better. virginia and victor - as toriel and asgore respectively - are still henrys birth parents by logic. enry finds himself immediately taken in by them, and through some form of magic (keep in mind henry was very young when he went missing in the cave in this au - around 3-5 -, he only really remembers life in the underground (either by pure childish bliss or trauma i dont know.)

so, years go by, nothing happens, until a week after henrys 13th birthday, another human falls down into the underground (unnamed nevada child aka - who patty reminds henry of instead of chara, ill just be calling them vadena cause its a simple anagram of nevada.)

he finds vadena after their fall, helps them, etc. everything we see in the normal game, and the lore follows as much until vadena falls seriously ill due to their plan to break the barrier and eradicate humanity with henry. as they fall ill and ask to see across the barrierm henry leaves his radio and spyglass on the floor in the garden in his hurry (he normally brings them everywhere). henry does the same as asriel and absorbs vadena's soul as they die and takes their body through the barrier to the stardust casino, vadena asked to see it one last time as it reminded them of their mother.

the humans, seeing this all powerful goat being holding the body of a dead child, assume that henry killed them. they attack henry, beating him near to death just like in the og game, and he doesnt fight back, you know all this stuff.

as a weak, battered and bruised henry stumbles back home to the castle, he falls to his knees infront of the radio and spyglass and turns to dust. (this is how he becomes the au's version of flowey, brenner uses the radio for his determination experiments and it becomes sentient due to the essence of henry being on it)

anyway. in his grief, victor declares all humans that fall down to be killed, virginia doesnt agree with this, divorcing him and taking vadena's body with her to be buried in the flowers from which they fell.

PRESENT GAME LORE:

patty falls down, they're met by a talking radio who only introduces himself as a member of the secret squadron, so patty just calls him radio (i cant think of any names god help me). radio does the whole "Hi! I'm radio, radio the radio! you must be new to the underground!" schtick before patty is saved by virginia, lore goes as follows until we meet hop and bob.

hopper is sans, but he looks like papyrus as it better fits with the proportions of the characters in st canon. bob looks like sans but is papyrus and alphys, etc. bob wants to be a apart of the royal guard by using his technological skills to help capture humans, bob is made a royal scientist for this but he still tries to show off his skill by capturing humans in snowdin. also, bob is convinced through his extensive research that he can disguise himself as a human by wearing a wig. he has hair because of this, hop has a lousy wispy moustache.

most puzzles are all the same, snowdin is hawkins, you fight one of bobs decoys instead of him as he is busy moving to the lab anticipating pattys arrival, we move to waterfall.

joyce wants to kill patty, because she knew vadena and is still somewhat grieving them? (tem village is just a village full of ted wheelers even though hes aaron because hes stupid and its funny)

joyce does not succeed, she just collapses at hotland like ingame and she runs off (there is the option to go to her house and befriend her it's a big thing where instead of cooking you have to impress her with an audition, and maybe cooking too.)

anyway patty meets bob at the lab and hes like "hows my favourite human doing? im like basically your brother from another skeleton now i have to look after you".

alan is a nuisance because why not make a murderous and flamboyant robot into a camp theatre kid. patty wins against alan and they move on to new home, tells the story of henry and (instead of a worn dagger its henrys captain midnight spyglass, still dusty. the locket has a picture of vadena in it)

victor fight goes as normal, he uses a bayonet ww2 rifle instead of a trident which is cool, patty beats him and the radio steals the souls whilst victor is distracted

he resets your save file and turns into this massive mind flayer resembling monster, with large mandibles and a demogorgon mouth with a spiked tongue. the radio replaces the tv screen on normal omega flowey, and theres a small tv ontop of it which displays memories from henrys life. patty beats him and neutral route done!!

TRUE PACIFIST

the true lab is basically hawkins lab, its ran by brenner and all of the amalgamates are test subjects 002 through 009 (henry was previously subject 001 as brenner found it interesting how he had turned from human to monster and now had a monster soul, also brenner is half human half monster if that interests anyone.)

brenner tries to stop patty from leaving with the information they have so hes a boss fight but bob saves them so yippee.

anyway asriel fight, henry is the god of divine retribution, he wants to rid the world of the injustice he faced by the humans using his god like powers, his second form is more human, as he absorbs the human souls he transforms back into what henry would have looked like at 14-16 if he hadnt of turned into a goat thing. eventually patty beats him and happy ending, if you go back to the ruins befire credits you can talk to henry as his normal form, you can do stuff with him and have cute little wholesome moments (and with enough talking you can bring him with you to the barrier because he deserves it!! i also made a secret ending where you can backstab henry and kill him because i felt like it (it isnt a real game i just make scenarios for it)

GENOCIDE

basically patty just kills everyone, they break into true lab and kill brenner, vadena takes control of them at the end. (every monster patty kills loses their eyes like how vecna kills people)