The original AU

Sans
~ Relaxed
~likes puns
~has a brother
~hardest to beat, but can die after 1 hit
~gaster blaster
~can teleport
~get him mad not kill his bro unless you'd like to have a B A D T I M E
~like to sleep like 90% of the time
~gaster is dad
~former scientist
~lives in Snowfall
~supports his bro
~likes ketchup
~lazy as heck
~1 hp
~ Wears a blue sweater
~ Megaloveania
~ That song that might play when you right sans

Frisk
~the genderless child that you're playing as
~they're around the age of 10
~you get give them a name (almost any)
~they can choose pacifist, genocide or neutral
~have an orangey yellow ish skin ???
~ Wears a blue and pink striped shirt/sweater
~ Stronger than you

Undyne
~member of the royal guard
~fish of some sort
~justice
~spear of justice
~calls Frisk 'punk'
~where's eye patch
~lives in Waterfall
~ Battle against a true hero

Alphys
~scientist
~shy, stutters
~lives in Hotland
~made Mettaton
~yellow hedgehog??? Dinosaur???? Animal of some sort. . .

Mettaton
~female
~robot
~has pink & grey parts with black hair
~made to destroy Frisk (by Alphys)
~ghost inside a robot body

Temmie
~HoI!
~female dog
~has temmie village
~has temmie shop
~temmie earns cash for 'colleg'(🤣)
~likes residue 
~sometimes is no sense
~ Wears a light blue and yellow shirt

Napstablook
~ghost
~male
~shy
~likes music
~does snail racing
~you won't see often in the game
~like to 'feel like trash'???

Chara
~1st human child
~hated humanity
~wanted revenge for humans banishing monsters
~Asriel's sibling
~dies from buttercups
~ Wears green and yellow shirt/sweater

Asriel
~asriel dreemur
~cry baby
~goat
~god of hyperdeath
~final form
~'it's save or be saved!'
~after you meet asriel from the battle-'don't kill & don't be killed right? that's the best you can strive for'
~toriel+asgore=ASRIEL
~only meet for  true pasifist as your final boss
~heart locket
~dies thus becomes flowey
~Wears a green and yellow shirt/sweater

Flowey
~souless version of asriel
~it's kill or be killed
~Howdy! I'm flowey, flowey the flower
~uncaple of love
~is caple of LOVE
~will be scared of you if you take genocide
~will fight as omega flowey at the end of pasifist
~first meets you at ruins to give you 'friendlieness pellets'??? (name sounds weird i mean friendlieness??? haha)
~when flowey absorbs the souls-GET READY FOR THE STANGEST THING YOU'LL EVER SEE IN A VIDEO GAME 
~he could help get you a REAL happy ending

Asgore & Toriel Dreemur
~king & ex queen
~toriel is mad at asgore for now making the rule to kill all humans that enter the underground
~toriel is in ruins, asgore is in new home
~parents of asriel, & adopted chara
~toriel likes Sans'puns

Papyrus
~sans' younger bro
~taller than sans
~'sans, you lazy bones! pick up your sock!'
~wants to become a royal guard
~loves spaghetti
~Nyeh heh heh!
~cinnamon roll
~wants to become a royal guard
~loves his bro
~ Wears a battle suit he wore since Halloween
~loves to help others
~doesn't like Sans'puns
~determined to capture the human

Muffet
~purple female spider
~has spider friends
~expensive foods
~spider dance
~she'll mistaken you for a mean human who hates spiders

Grillby
~monster made of fire
~owns a bad
~gives fries, ketchup and burgers
~cool

Bratty & Catty
~sassy
~ In the ally

Theories
~ Sans & papyrus= Gaster