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Inverted Fate is an Undertale AU taking place after a failed pacifist run. Asriel won the final battle and started to reset time, but lost control of his powers, resulting in the six main characters or "lost souls" swapping places but not personalities.
About the AU
Asriel succeeded in resetting the timeline, but something went wrong. He's reverted to Flowey without any of the souls in a timeline he can no longer predict. The 6 main characters, as a result, swap places (Toriel and Asgore, Sans and Papyrus, Undyne and Alphys), but personalities remain the same, which leads the characters down different paths of life. Their decisions in their new positions snowball outward to the world, and while some monsters fare better than others, the Underground on the whole is more wary of humans.
Upon Frisk's return, Flowey decides to take advantage of the kid by pretending to be their friend. He teaches them all about their ability to SAVE and LOAD, all while striking a deal with them. If they take him to the castle, he'll find a way to break the barrier without casualty, but it's all just a convenient lie so that he may regain his powers and initiate a plan even bigger than before.
They're later joined by Papyrus who seeks to protect Frisk at all costs. It doesn't matter if sticking up for them risks his reputation among his fellow monsters. It doesn't matter that Undyne, his best friend and lab partner, seeks to claim the final human SOUL regardless of Frisk's kind nature. In an Underground bitter at past tragedies, fearful of future suffering, and desperate for freedom, he continues to believe that anyone, even humans, deserve a chance.
- The main antagonist in this story, he remembers his canon life completely, including Frisk's actions during their initial neutral and pacifist runs up until his defeat. However, he lacks any memories of this new timeline other than what he's experienced since awakening.
- Pretends to be Frisk's friend for the sake of his ulterior motives. Plays himself up as an expert on this new Underground despite his lack of experience, and informs them of their ability to SAVE and LOAD, the barrier, and the war.
- He still projects onto Frisk at first, though he never directly calls them "Chara," opting to call them "kid" most of the time.
- Ends up roping Papyrus into his plans later on, but is extremely evasive of everyone else, especially Sans.
- Seeks to reclaim the SOULS, but his objectives have changed. He aims even higher than before.
- The main character, Frisk is no longer a silent protagonist but a full-fledged character with their own personality and ambitions.
- Unlike other Frisks, they're far from an innocent angel. They're sassy, a bit blunt, and not afraid to speak their mind. However, they do try to do the right thing and genuinely want to be liked by others. They're insanely insecure, but mask it under phony charisma and optimism.
- They only vaguely remember the original timeline through foggy deja-vu.
- They're fond of anime, video games, and enjoy wordplay. Their favorite types of heroes are the charismatic rogue types.
- Their outfits change as they progress through the story.
- Grows quite close to Papyrus over the course of the story, viewing him as their best friend in time.
- Regularly speaks to Chara, calling them "Captain Cryptic," much to their chagrin.
- They're twelve years old and kinda scrawny.
- The secondary protagonist and Frisk's party member.
- A self-proclaimed "SCIENTIFIC GENIUS AND PUZZLE MASTER!" He's created many inventions with varying degrees of success, from working teleporters to hover boards and a supposed de-lazifying laser. He uses many of his skills for the sake of quality of life improvements as well as crafting innovative puzzles, but many monsters find his "improvements" in Snowdin Forest more cumbersome than convenient.
- He's Undyne's lab partner and has worked alongside her for three years. He took up the sciences to pick up where his brother left off ten years ago, but has since grown to genuinely love his work and its many applications in both cooking and puzzlery.
- While still as goofy and eccentric as his original self, he's much more aware and knows more than he lets on. He's also quite skilled in defensive and support magic, as well as combining chemicals for a variety of effects. He uses this skill to aid Frisk in battle.
- He promised Asgore to protect Frisk at all costs and believes in them wholeheartedly. His dedication is what prompts him to join Frisk as a party member.
- Is fully on board with Flowey's plan to free everyone, even if it means keeping said plan a secret from those he cares about, like his brother.
- Views Asgore as a father figure and regularly speaks with him over the phone as well as through the door. He doesn't know Asgore's true identity and refers to him as "Santa" and "Mr. Claus."
- Can read EXP and LV.
- Is eighteen years old.
- Is Frisk's narrator and remembers their previous runs in their entirety.
- Resented Frisk at first due to their hatred of humanity and only assisted them due to the two sharing a body, thus when Flowey's "friendliness pellets" hit them the first time, it became apparent that any damage Frisk took would hurt them, too. They reluctantly guided them as a result, but later grew attached to Frisk as they defied Chara's expectations time and time again.
- Is very pretentious, sarcastic, and cynical, especially now that they're in the new timeline. They feel powerless, and the knowledge of Flowey's true identity gives them conflicted feelings on the whole.
- As the story progresses, they slowly start opening up to Frisk, talking to them on a more personal level rather than just as a distant narrator.
- Is just a voice in Frisk's head. They have no ghostly form. Despite this, both Mettaton and Napstablook can hear them just fine.
- Is quite fond of anime and prefers Mew Mew Kissy Cutie 2 over the original.
- Frisk calls them "Captain Cryptic."
- Has the ability to use Frisk's body when Frisk is asleep. Frisk can't remember anything that happens during the possesion.
- Was around 11 when they died.
- Former king of the monsters, he was the one who declared war on humanity, just like in the original game.
- However, he was unable to commit to his plan, and after the first SOUL was taken, retreated to the Ruins to atone.
- Hides his burdens under a smile and focuses on improving life within the Ruins wherever he can. He's planted gardens. He's left his home open to any visitors, hosting weekly tea gatherings, and even softened the more dangerous puzzles by removing spikes and adding pillows to cushion the pitfalls.
- Is very close to Napstablook, having assisted them with their self-esteem issues and often lets them stay in the guest bedroom in his house.
- Is a father figure to Papyrus and later Frisk. He's known Papyrus for many years and has shared his knowledge of plants with him, while Papyrus has shared his enthusiasm for puzzles and cooking.
- Does not begrudge Toriel in the slightest, feeling as though the more hopeless state of the Underground is his fault and that she's the more deserving ruler.
- He's much more hands off with Frisk during their time in the Ruins, allowing them to explore and discover on their own. He only grows more protective after an incident involving three hostile monsters.
- Only keeps the Ruins door closed to keep out the cold and to protect the privacy of those who live there. In truth, he welcomes visitors with open arms.
- Still in their original position.
- While still shy, soft-spoken, and occasionally insecure, they're a lot happier in this new timeline due to Mettaton remaining a part of their life and due to Asgore's support.
- They're Mettaton's sound mixer and occasional costar. The spotlight's helped a great deal with their exposure, and their CD's have a bit of a following, but often times the pressures associated with stardom grow too much for the ghost, and they retreat to the Ruins for a breather.
- Befriends Frisk fairly fast and remains one of their most avid supporters, despite the overall hostile atmosphere toward humans.
- Worries that Mettaton may not be as happy as he lets on.
- Vice captain of the royal guard and chief of Snowdin's Canine Unit.
- Despite his high rank, he remains as laid back as his original coutnerpart, albeit more motivated due to his lack of knowledge on RESETs.
- Still loves bad puns, pranks, fast food, and relaxing, but has gained an appreciation for anime thanks to spending time with Alphys. He especially loves bad dubs for the comedy value, much to her annoyance.
- Used to be involved in the sciences, but hung up his lab coat for good more than a decade ago. He joined the guard at age 18, but never told anyone why. It wasn't for himself.
- Is very protective of Papyrus and worries what his friendship with Frisk will do, not only to his reputation, but with his friendship with Undyne. Nonetheless, he allows Papyrus to carry on for a while, watching closely and playing it cool. As they make it through Snowdin Forest, he starts developing a soft spot for Frisk.
- Due to his guard training, he's much stronger, but can still use his Karmic Retribution as well as chip damage. Regular attacks can deal more base damage with invincibility frames, while chip damage moves still do one damage per frame and require greater concentration. Still has his Gaster Blasters and gravity manipulation.
- Still utilizes shortcuts to get around, and in fact uses this skill to scout for both Alphys and Toriel, since he can get around quickly.
- Treats his subordinates more like pals, believing that it's the best way to encourage cooperation. Force ain't really his style.
- Knows what it takes to leave the Underground, thus is wary of letting Frisk leave Snowdin.
- Doesn't trust Flowey in the slightest, and is wary of Undyne.
- Used to be Undyne's tutor.
- Frisk is not a silent protagonist. This is because Frisk doesn't have a player (despite this, they can still SAVE, LOAD and RESET).
- Papyrus is a party member and follows Frisk out of Snowdin into Waterfall and Hotland.
- There is a place that is not in any other AUs nor Undertale, "Fort Aquarius". Fort Aquarius is the HQ for the Royal Guard. There is also a town in Waterfall called “Forgespring”. This is presumably where Gerson lives.
- Mettaton and Napstablook don't swap. This is because Napstablook didn't want to be corporeal and Mettaton's body was built by Undyne as a favor to Alphys. Because he was built by Undyne, he is based on shounen anime, making him look flashy and cool.
- In the room where the training Dummy was, Napstablook is in the place where the dummy was, to inform Frisk and Asgore that the dummy has gone out to lunch.
- Flowey remembers the canon Undertale timeline, along with Chara.
- Flowey acts nice and helpful to Frisk. According to the FAQ, he's like this because "it's convenient".
- There is an Ace Attorney-like scene planned for the AU. It's going to be set in Hotland, and Papyrus is Frisk's lawyer and Undyne is the prosecutor. This will be one of Mettaton's TV programs.
- Chara is the Narrator.
- Doggo looks similar to and acts like Vegeta from Dragon Ball Z.
- Catty and Bratty dresses similarly to Ruby and Yang from RWBY.
- There are various references to video game weapons such as the sword from HALO
- Being that this takes place after the pacifist timeline