Okay, so headcanon confirmed by HungryGremlin: It's already been decided that Frisk speaks ASL in this story. Sometimes, signing out every letter of a name can be irritating, so Frisk just tends to call people nicknames. For example, "Sans" is "Hoodie", "Papyrus" is just "Scarf", "Mistral" is "Misty", and stuff like that. If there are any ASL speakers (signers?) that are offended by my way of thinking this through in any way, shape or form, feel free to tell me and it will be changed.

Reviews!

MoonlightShine4: For the word "an", it's not so much what letter it's directly in front of, it's more of the sound it makes. Since "hour" has a silent h, it uses the word "an". At least, that's what I remember.

Terra: Sorry, I forgot to put my tumblr on the last few updates. It's still darkphoenix512. tumblr. com

C.W: No, Mistral's not suffering from PTSD. It's more like the crack in the back of his skull is screwing with him, to bluntly. All skeletons (on at least some level) are able to, at will, glance at other timelines and universes to see if there's a situation happening similar to what they're trying to find mentally, acting kinda like a search engine of the multiverse. For Mistral, though, the crack is making the search engine search at random, usually when the things are associated with bad memories.

Thank you to XxOmNiPoTent PriMorDial GodxX, Curious Kit, Ender the multiverse Detective, Pokemonever1994, crazy dragon ninja, Guest, Arashi - IV of VI (seriously what are you the fourth of six of), and JanKHonda for reviewing!

"Oh, Mistral, it is wonderful to have you visit. And...Hermione Granger, was it? I do hope I said the correct name, it is hard to remember those I have yet to teach. Either way, feel free to make yourself at home."

"Professor Toriel? Frisk is your child?"

"Yes, they are. To think, they went through so much trouble to reach the surface only to stay with a worrying old woman like me!"

"hey toriel? papyrus said that he and sans would be coming over later with hermione's parents."

"Well, if that is the case, I must begin preparing dinner! I apologize, Hermione, but I did not expect you and your parents to be here as well!"

"I...I honestly didn't expect to be here myself, Professor Toriel. To my knowledge, my family and I were supposed to be spending the night at Mistral's house and eating there."

"heh...yeah, you don't wanna eat at my house. frisk knows what i'm talking about."

*You shudder at the mention of Papyrus's cooking.

"hey, my brother's a great cook! it's just nearly impossible to balance out the magic in the food for both humans and skeletons!"

*You disagree with Mistral.

"Frisk is right, Mistral. I have seen you eat food that I have prepared before, and I use no more magic than any other monster."

"yeah, i've tried to eat your food. it's really good, toriel, but...i can't...uh...mmhmhmm..."

"You cannot what?"

"i can't digest it. i can get all the taste, just nothing that'll help my soul keep going...sorry, toriel..."

*You tell Hermione to follow you.

"What? Why?"

…

"Silence isn't an answer, Frisk."

*You tell Hermione that the children of Newer Home are going to the playground to play a few games.

"Oh, is that where Mistral's run off to?"

*Yes.

…

…

"...okay, let's go then."

"Hey! Friends! Over here, I'm here, waving on the monkey bars!" a voice called out from across the playground, startling Frisk and Hermione.

The two stared at each other in confusion. "Was...was that Mistral?"

Frisk shook their head. *You tell Hermione that Mistral never sounded like that before.

Slowly, the humans looked over to the monkey bars to see Mistral grinning down at them. His cloak fell behind his shoulders, as if it was attempting to mimic a cape. Surprisingly, his hood was down as well. His brightly-glowing pupil lights skirted over them as if they weren't even there before he did a double take. "Huh? Granger?" he asked, genuinely confused. "Why are you here? You make fun of Asriel every chance you get. And Chara, what's with the wardrobe change?"

Hermione frowned, oblivious to Frisk's shocked look. "Who's Asriel? And aren't you thinking of Ronald Weasley picking at Monster Kid and Fire Girl?"

Mistral cocked his head. "Monster Kid? Fire Girl? Fire Girl wasn't part of the group going to Hogwarts, Skateboard Girl was. Waaaait a second..." He jumped down from the top of the monkey bars, doing a backflip and landing on his feet. Leaning towards Frisk, he narrowed his eye sockets and frowned slightly. "Chara, let me see your eyes."

Hesitantly, Frisk lifted their eyelids from their usual half-squinting position, revealing their dark brown color. Misty, don't say that name!

"Okay, so you're not being possessed again..." he muttered, rubbing his mandible. "And Granger is in Sanctuary for some reason..."

"Actually, we're in Newer Home," Hermione corrected. "Are you feeling well?"

Mistral blinked. "You're...you're worried about the well being of a monster?" he asked, stunned. "Okay, now I know something is wrong. Granger, Chara-" Frisk flinched at the name, "-do either of you know where Papyrus would be right now?"

Frisk frowned, but nodded. Something was really off about Mistral...

Meanwhile...

Mistral scanned the playground from under his favorite tree, watching for his friends to come in. He froze, though, when he saw Ron Weasley walk by him with Frisk, who was wearing a green and yellow striped sweater instead of their usual magenta and blue. "what are you doing in newer home, weasley?" he muttered, narrowing his eye sockets. Keeping to the shadows, he followed the two.

"Where could have he disappeared to? Are you sure he said the playground?" Ron asked, sounding very...Hermione-like.

Frisk shrugged. *You tell Ron that Mistral said that he would be on the monkey bars.

Mistral frowned. The bad part about Frisk speaking with text boxes was the fact that it was impossible for him to ever get a read on their emotions when they did.

He looked over the crowd of kids playing again, this time noticing something...off. Monster Kid wasn't even there, instead there was a strange Boss Monster running around. Fire Girl was holding a pair of roller skates while talking to Skateboard Girl, who, surprisingly enough, had no skateboard. "...what the hell?"

"Mistral! There you are!" Ron exclaimed as he ran towards him, throwing his arms out and enveloping the skeleton in a hug.

Immediately, Mistral began panicking. "h-hey, let me go!"

Ron let go, taking a step back. "Mistral?" he asked slowly. "Are you feeling okay?"

In response, Mistral's left pupil light grew, glowing blue, while his right lit up green. "why are you here, weasley? did you do something to mk?" Frisk stiffened, making Mistral turn to them. "and what's with the wardrobe change? i mean, you're allowed to have freedom in your choices, frisk, but you never take off your sweater!"

Misty, don't say that name! Frisk signed rapidly, a look of fear crossing their face. My name is Chara, not that!

Mistral's eye sockets widened. His gaze shifted from Ron to 'Chara' multiple times before he bolted, yelling, "nope, i am not dealing with this right now!"

Without hesitating, the two gave chase. When he turned a corner, they followed only to see that it was a dead end, and that Mistral was no where in sight. "I hate it when he does that," Ron said, irritated.

Frisk led Hermione and Mistral into the skeletons' house, not even bothering to knock. Hoodie! Scarf! Misty needs you two!

A shriek was heard from upstairs before Papyrus's bedroom door slammed open. "BROTHER, DO NOT FEAR!" As the skeleton's voice echoed through the house, Papyrus ran down the staircase, stopping in front of the three of them to pose heroically. "I, THE GREAT PAPYRUS, WILL DO EVERYTHING IN MY POWER TO AID YOU!"

Mistral blinked once, then twice. "This...is not something I ever expected to see."

Papyrus froze, confused, before bending over to look the younger skeleton in the eye sockets. "WHAT IS SOMETHING YOU DID NOT EXPECT?"

"You...being energetic, not being lazy, and, a big thing here, not smoking," Mistral said, much to the shock of everyone else in the room. "Papyrus, do you feel the urge to go to Muffet's?"

"WHAT?" Papyrus asked, confused. "MISTRAL, YOU KNOW FOR A FACT THAT MUFFET IS STILL ATTEMPTING TO EXPAND HER BAKE SALE TO THE SURFACE!"

Mistral stared at Papyrus, dumbstruck, before his pupil lights faded. His body went limp as he fell backward.

Sans sighed as he looked around the newly-finished New Grillby's (Asgore's naming skills hadn't improved). The usual patrons from the underground were there, all enjoying their burgers and fries. No new faces really showed up, save for a few monsters that had lived too far off for the boat ride to be considered worth it.

It had been the first time in a while that he had visited the bar/restaurant, but it felt like he had never left. The interior was an exact replica of the version underground, so it was easy for Sans to settle into his usual place at the bar. A jukebox in the corner (that actually worked) was playing sans. on loop, showing that yes, it was still broken at least somewhat.

He had just lifted his bottle of ketchup up to take a swig out of it when an alarm began going off in the back of his mind. Sans sighed again as he set down the ketchup. "what'd misty get himself into this time?"

Mistral closed the door behind him as he entered his...house... "this is not my house," he mumbled, "but it's right where my house should be. but my house doesn't have an ash tray by the couch..."

Hesitantly, he made his way up the staircase, his eye sockets narrowing as he went. Papyrus's room, the closest to the staircase. The door was bare of designs, and locked. Farther down the hall, Sans's door was covered in police tape and signs of various sizes. Mistral's door, strangely enough, looked exactly the same, with its "Abandon All Hope, Ye Who Enter Here" sign (don't ask) still tacked to it.

Mistral slowly opened his bedroom door, worried about what he would find inside. What he saw made him stare in shock. "s-someone...c-c-cleaned my r-room?"

"actually, that'd be your doing. or, i guess, other you's doing?"

The cloaked skeleton froze at the voice in the doorway. It sounded familiar, but at the same time, out of place. Either way, Mistral couldn't bring himself to turn around.

"look, i know you're not my mistral, and you know you're not my mistral, so let's make this easy. what au are you from and where's my mistral?" The sound of magic bringing several bones into existence made Mistral flinch.

"w-what do y-you m-m-mean?" Mistral asked, not wanting to anger the speaker. "i'm mistral."

"yeah, you're a version of mistral. original's from the misttale au instead of the full-blown undertale, so what are you from? i won't ask again."

Sans, at this point in time, has been through enough with Mistral to have a sixth sense about when things are going wrong.

US!Papyrus just knows that his brother isn't acting like his brother, and that other AUs are out there. For all he could know, the psychopathic Underfell Mistral could be standing, waiting for an opportunity to strike.