Fallen Brothers

Created by Super Isaiah

**Fallen Brothers** is an AU created by **Super Isaiah**, where the characters positions have been changed due to passage of time, the environment, and the actions of the fallen humans, to loosely fit the roles in SwapSpin. The idea was originally for this to be kind of the equivalent for SwapSpin of what Inverted Fate is to UnderSwap. For this reason, the AU is also known as **FB!SwapSpin.**

This AU has been worked on on-and-off since 2020, and there is a fan game being worked on as of 2022.

## Characters

### Undertale Characters

#### Chara

Chara is the 8th human to fall into the underground. They are 10 years old in the events of the story and they left home and jumped into Mt. Ebott with the expectation of dying, only to instead fall onto the grave of a skeleton monster.

The written version of Chara is obsessed with the concept of linearity, though this may not transfer into the fangame version of this character.

#### The Orange Soul

The first to drop into the underground. Orange Soul assumed the monsters were evil as soon as he met them and he attacked, only managing to kill a couple monsters before Asgore stepped in and killed them.

#### The Yellow Soul

The second to drop into the underground, searching for Orange Soul. after finding out the monsters killed that human, Yellow Soul attacked them out of vengeance. Once again, Asgore killled them to stop them.

#### The Purple Soul

The third to fall into the underground. Purple Soul was spotted fighting monsters and King Asgore took their soul before they killed anyone.

#### The Green Soul

The fourth to drop into the underground. King Asgore had Green Soul killed unprovoked.

#### Frisk

The fifth human to come into the underground. They came to the underground 10 years before the events of the story, at the same time that they would have fallen in Undertale. (Yes, that means that the story of the game takes place 10 years after when Undertale would've taken place. That's why all the monsters are older in Fallen Brothers.) Frisk did a pacifist run, but couldn't break the barrier, so they decided to just hang in the underground with their new fandom of monsters.

After Frisk fell into the underground, they became an instant star. Growing up in an environment where they were constantly told they were "probably the only good thing to come out of humanity", Frisk seems to have taken that to heart and become a bit of a diva, taking the spotlight from any other star in the underground, including the robot who was once their partner in creating entertainment.

#### The Blue Soul

Blue Soul was protective of Cyan Soul originally. Early on, monsters came around and threatened the pair. Thinking that they were doing the right thing, Blue Soul killed the monsters to defend Cyan Soul. At the time, Cyan just waited, hoping that Blue Soul would rethink their tactics, but waited too long. Blue Soul eventually became driven mad with power and went on a rampage killing passive monsters. The Blue Soul came with Cyan Soul to the Underground a few years before the events of the story.

#### The Cyan Soul

Cyan Soul rarely ever spoke. They had a stuffed cat they held for comfort, and after Indigo Soul went on a rampage, Cyan Soul finally tried to stop them. But at that point it was too late, hearing the news of papyrus' death, Queen Undyne put a stop to the rampage, ending both humans lives and taking their souls. She told everyone that both humans were killing monsters, but those who knew them well knew that Cyan Soul didn't kill anyone. This moment caused a lot of tension between monsters and all humans except frisk, who at this point they are convinced is the only good human in existence.

#### Papyrus

Papyrus died long ago at the hands of the human with the Blue Soul. He is dead. No, Papyrus is not the narrator. Papyrus is just dead. He is not coming back, despite what someone else may be hoping for.

#### Sans

Sans was good friends with the Cyan Soul human. He knew Cyan Soul was a good kid, and was very torn when both his friend and his brother died the same day. He ran tests on the Cyan and Blue Souls to isolate the traits similar between the two. He found the trait, and replicated it. In a desperate attempt to "fix" the timeline and bring back those killed that day, Sans used this trait on himself. At the time, he had Cyan Soul's cat plushie to remind him why he's doing this. Neither the cat, the two souls, or Sans have been seen since.

#### Comic the Cat

Comic is a friendly cat that Chara meets when they first enter the underground. Comic never harms Chara, instead he seems to grow a bond with them as Chara works their way through the underground. Comic has a knack for puns, and his fur is soft like plush. He has friends throughout the underground, and even owns his own casino down in Vestige City. Though no one seems to know where he came from..

#### Toriel

Orange soul came to the underground quite early in Asgore and Toriel's relationship. When he killed Orange soul, it started to drift the two apart. As he became more and more quick to kill the humans, Toriel drifted further apart from him. Eventually moving into the ruins, that is, until Frisk came along.

#### Asgore

Asgore started killing humans more and more quickly, and when frisk came along, he recognized how this was wrong of him. He decided that it would be best for him to retire. He crowned his most trusted royal guard, Undyne, as the new queen shortly after Frisk came to the underground. Frisk convinced Toriel to give Asgore another chance, and she certainly did! Not long after frisk came down, the couple had a baby, who they named Asriel. The two reside in Springdin, in the house once owned by skeletons, raising their child together. Toriel is eager to meet and protect Chara, while Asgore is a bit more cautious around the human (while still trying to remain friendly)

#### Asriel

Asriel is a young boy the same age as Chara (10 years old, to be precise) in the events of the story. Chara goes on a playdate with him after gaining the trust of Asgore. If you win the playdate game (which is impossible to lose), Asriel then hangs out with Chara throughout Flooded Falls, helping them to stop fights peacefully.

#### Undyne

Undyne is an old fish monster. She became queen after Frisk fell into the underground. Despite Frisk's popularity, Undyne never liked them. She'd kill frisk and set the underground free if it weren't such a public way to break the vow she made with asgore to treat humans fairly. Undyne tends to keep to her self, hoping a human will attack. Though after waiting so long, she may not be willing to wait for a human to attack first anymore...

#### Alphys

Once close with Undyne, she's started to become uncomfortable with Undyne's dislike of humanity, and doesn't trust her anymore. She's instead spent her time using cooling technology to turn what was once the Ruins into a giant refrigerator, creating Vestige City in the process, a safe haven for the snow monsters during the Thermal Equilibrium Crisis. She has taken up an apprentice to help her maintain the place.

#### Monster.. Adult?

Monster kid is now a young adult looking to make a difference as a scientist. He's Alphys' apprentice and he's incredibly optimistic about humans, despite how the human who was his friend growing up seems to have forgotten him.

#### Mettaton

Mettaton is a fallen idol, a has been. He was once in the big leagues, living in fancy hotels and owning his own fast food chain. All of that has since been takne over by Frisk, who was once his entertainment partner. He wants nothing more than to create a show that'll get higher ratings than Frisk's. Something fresh, something new. He seems to no longer have much of a relationship with any other monsters, and spends an odd amount of time in the old lab...

#### Napstablook

Years of isolation and being ignored by their only friends, Mettaton and Frisk, has driven Napstablook a little bit crazy... or a lot crazy. Depends who you ask. Just try to not catch their attention when you're hanging out near where their house once was, before Waterfall was flooded.

#### River Captain

River Person has decided to promote themselves to captain. They'll take you and Asriel across Flooded Falls in their large ship, all you got to do is ask nicely.

#### Jerry

Jerry is well renowned as a jerk, but ever since his phone broke he's had nothing to do but self reflect. Since then, he's become good friends with the only monster who couldn't ditch him. Mostly because said monster has no legs

#### Snowman

A talented singer who no one really seems to notice, despite the fact that Alphys built him a stage in the center of town to stay on. One day, Jerry came along after breaking his phone and started whining to Snowman about it. Whining became confiding, and confiding became conversation, and conversation became mutual friendship. Now the two are good friends, and Jerry learned how to play the drums just so he could help Snowman achieve his dream of being in a band. Now all they need is some more band members, but the fact that Jerry's so well known to be a jerk doesn't help their band's popularity..

#### Nice Cream Guy

Nice Cream Guy now owns Grillby's old location and has teamed up with his business partner ICE-E to turn it into an ice cream & pizza parlor. He is a happy man who loves giving people nice cream. He doesn't care that no one seems to know his actual name.

#### The Tattered Temmies

A group of adorable pirates sailing across Flooded Falls. After their small business failed, they had to leave their village in search for money. Don't let their cuteness fool you, this crew can "plundr" all of your "muns" quite easily if you don't keep them at bay.

#### Onionsan

When you see a large, onion-like beast approach your ship.. Don't fire the harpoons! That's not a beast, that's Onionsan, and she's probably just here to sell some of her wares to you.

#### Burgerbag

After losing his job, Mettaton took his official MTT uniform away. Which happened to be the only clothes he had. He now lives in an old moist cave wearing nothing but a trash bag. Don't worry, he snuck a bunch of burgers with him when he left. I think given the new name you can put two and two together.

#### Grillby

After Sans disappeared, business at Grillby's seemed to get a lot slower. The fact that the place was no longer all that cold didn't help him sell his hot food either. Out of business, he sold his restuaraunt to a business that was quickly succeeding thanks to the change in temperature, and went looking for a job. With his credentials, Mettaton deemed it a no-brainer to replace his old employee with Grillby.

### Added Characters

#### The Pine Trees

The Pine Trees are a race of tree people residing in Conifer Caverns. They are a peaceful people, though they have bad blood with the spruce trees in Springdin.

#### The Lorloox

The Lorloox is an old Loox fellow who seems to think of himself as the protector of the Pine Trees. He attacks Chara after Chara accidentally breaks Alberoto, the king pine tree, though if King Alberoto gave Chara the King's Bark before breaking, Chara can get out of the fight much easier.

#### King Alberoto

King Alberoto is the king of the Pine Trees, and Chara climbs him to get over a bunch of shrubs. He tells them to swing on his longest branch, like the humans before them, but this time it seems the weight was enough to break him.

#### Annoying Frog

Annoying Frog is a Froggit that is very annoying. He can be seen bouncing all over the place, annoying anyone he can. At least he can't cause any real harm. At least, unless if he were to find some wooden war suit to attack with, but that would never happen.

#### Nicer Frog

Annoying Frog found a wooden war suit. Nice >:]

#### The Herp Guard

The Herp Guard is a group of well trained amphibian and reptilian monsters residing in Springdin.

#### Howard

Howard is Howard. He is known for saying "*Howard* you doing today!" and "Huh-a-huh!" He has a tendency to end up wherever you need him to be. But at the end of the day, his only real goal is to make it to New Zealand.

## Locations

### Undertale Locations

#### Conifer Caverns

Some pine tree seeds seem to have made their way down Mount Ebott, and due to the residual magic in the area have seem to become sentient. The oldest of the pines, King Alberoto, has been in the underground since before even the monsters got trapped down there. This area replaces the small area before the ruins (the place you fall and the place you meet flowey) though it's larger than that.

#### Vestige City and the Unruins

When all the snow in snowdin started melting, the snow monsters found themselves in need of a cool place to stay. Alphys invented machinery that keeps what was once the Ruins chill and snowy. In time, a whole big city of snow folk rose in what they called the Unruins, and they called it Vestige City, a name that was sarcastically given to them by Jerry (back when Jerry was a jerk), who was trying to say that snow monsters were a relic of the past and will soon be forgotten by everyone else. This was either intentionally self deprecating or idiotic, because Jerry himself is a snow monster living in Vestige City. Since the people didn't know what vestige meant, they went with it.

#### Springdin and the Spruce Woods

When the snow in Snowdin melted, everything became much more lush. Many of the monsters from other areas opted to move to what they now call Springdin, as well as the surrounding woods. Some of the more adaptive snow monsters opted to stay here as well.

#### Flooded Falls and the Secluded Beach

Well, where did you expect all that melted snow to go? What was once Waterfall is now incredibly flooded, to the point where you can't really get anywhere without a boat. Many of the monsters here are either adapted to a fully aquatic life, or live on boats. Some of them moved to the Secluded Beach, though people seem to have a hard time finding this beach.

#### Moistland

All of the lava in hotland has cooled off, and the place is no longer all that hot. Now it's mostly just warm and humid. Some of the more slimy monsters opted to move here of their own volition, though most of the residents just can't afford to live anywhere else.

#### Heatsink

The CORE has become quite hot, it's where most of the heat has seemed to end up. As such, many of the heat-loving monsters live here now. Thanks to a long forgotten scientist, there is a rod in the CORE that goes directly to the center of the earth, supplying this place with plenty of heat, as well as providing electricity for the rest of the underground.

#### New Home

Not much has changed here, though the place seems to generally be a lot more lonely. Queen Undyne is one of the few residents here.

## Miscellaneous

### Flowey

For obvious reasons, Flowey never exists in this timeline. Asriel never died, for one, but also because Asriel couldn't have crossed the barrier anyway.

### Crossing the Barrier

The Barrier can not be crossed by any monster. Only broken with the power of 7 human souls. As such, a monster crossing the barrier with one human soul to get other souls is not an option.

### Minigames

There is planned to be at least 2 minigames in the game.

One is a climbing minigame, where you climb up a tree. First one is King Alberoto, which can only be done at the beginning of the run, the second is in Springdin where you can try playing it any time you want.

The other is a guitar hero like game where Chara plays Keytar in Snowman's Band. The more band members you find, the harder the songs get.

### The Thermal Equilibrium Crisis

The cause of many of the differences in the underground, The Underground has seemed to have the cold places seep into the hot places and vice versa.

### Human Styles

The "styles" of each of the humans swapped between each other, so each of the souls would be distinct from other incarnations of their designs. Their core personality traits stay the same, but clothing, backstory, age, gender, and so on are subject to change because of this. For example, Chara "swapped" styles with Bravery, hence why chara has boxing gloves and a bandanna, they just wear and use them in a way that's more reflecting of an innocent, impressionable child. The exact designs of each character and how they have been swapped have not been decided yet, but the style swaps are: Frisk swaps styles with Integrity, Patience swapped styles with Perseverance, Kindness swaps styles with Justice, Chara swaps styles with Bravery.

## Story

* Written Version: Part 1
* Fangame Dev Gameplay

## Gallery

Tori - Created by Super IsaiahChara - Created by Super IsaiahComic the Cat - Created by Super IsaiahComic wALK - Created by Super IsaiahSkeleton Grave - Created by Super IsaiahLorloox - Created by Super IsaiahKing Alberoto - Created by Super IsaiahAsriel - Created by Super IsaiahJerry - Created by Super IsaiahAnnoying Frog - Created by Super IsaiahNicer Frog >:] - Created by Super IsaiahTattered Temmie - Created by Super IsaiahBurger Bag - Created by Super IsaiahHoward - Created by Super Isaiah"Little Buddy" - Created by Underdog234"A Humble Night" - Created by Underdog234"Springdin Forest" - Created by Underdog234"A Punny Cat" - Created by Underdog234
## Trivia

* The cat plushie Cyan Soul had is (in-universe) designed off the cat from a human TV show called *"Garteal"*.
* Despite what they may sound like, Chara's voice sound effects are all recorded with an electric guitar, using combinations of tapping and scraping.
* If you enter a specific name, it changes a lot about the gameplay. This name will not be given to the public at any point by the dev team. Good luck ever figuring out what it is!
* Conifer Caverns started as just a single Pine Tree that you can climb in the area before the Unruins that would break. Originally, this wasn't even part of the story, and was just an optional gag where you try to escape the underground by climbing out, but it would just break the tree. After the tree climbing section was fully programmed, the author opted to actually make it part of the gameplay, with the entire story and subarea for Conifer Caverns based on that concept. That is why the door to the Unruins is right near the beginning, and the only reason you need to wait to access it is because the tree you climb falls over, blocking the entrance and making you go through the Conifer Caverns first.
* The whole entire running gag of the shrubs was, as you'd expect, originally just from needing a way to temporarily block an area. Now the shrubs are so prominent in the game that they almost require a character segment!