This is what you came for (RWBY x Undertale Reader)

Arrival in Beacon

You come out of the portal in what appears to be a forest and you look around confused

(Y/N): Gaster what is this AU?

Gaster: I don't know This one is new to me, so I guess we are...

(Y/N): Don't say it!

Gaster: Wing Dinging it! *drums sound*

(Y/N): *holding in urge to yell* Lets take a look around

after some walking you come across what appears to be dark looking wolfs

Gaster: these must be the natives

The wolfs then notice you and growl

(Y/N): well then lets give them a proper greeting

you put your hands in your pockets as your eye flares up Then two wolfs charges at you only for one to get headshot by a bone and the other to get blasted by one of your gaster hands.

(Y/N): *yawns* next

Then the rest of the pack charges at you with you teleporting and dodging them while hitting them with bone attacks then you land on the ground and they all circle you

(Y/N) *sarcastically* oh I appear to be outnumbered! what ever shall I do?

then they all jump towards you and you teleport and they collide into each other, Then 7 Gaster hands surround them and Blast them into dust.

(Y/N): Easy *dusts off coat*

Gaster: you seemed to really enjoy that

(Y/N): If that's as dangerous as the creatures here get then this will be a slice of butterscotch cinnamon pie.

*Timeskip bought to you by Chibi (Y/N) yelling at Chibi Gaster*

you continue walking till you reach a clearing where you see more wolf creatures

(Y/N): I'd rather not waste my energy on them so lets just keep going

Gaster: Wait! who's that?

you turn your head to see someone with a red hood and cape walking towards the wolfs

Gaster: That person is in danger! we have to help her-

before you can react the figure Disappears leaving behind rose petals and then you spot her above the wolfs and you see her hood off her head showing that it's a girl with black hair that has red tips and she has Silver eyes and then you see her fight the wolfs.

(Y/N): Whoa

Gaster: That was.....AWSOME did you see that!!!

then you notice a wolf she missed jump at her but before it can make contact you blast it into dust with a gaster hand.

*Ruby's POV*

I heard a noise and turned around for a Beowolf to almost hit me when I see a flash and it turns to dust

Ruby: what?!

I then look over to see someone wearing a black coat with a turtle neck sweater and completely Black creepy eyes.

???: you need to be more aware of your surroundings...

The figure starts to walk away when I run up to him

Ruby: wait!

???: what?!

he seemed annoyed

Ruby: I just wanted to say thank you....

(Y/N): Asterisk

 Ruby: well thank you for that save also how did you do that?

(Y/N): with these

Then some white hands with holes in them appear in the air behind him and I was amazed

Ruby: Whoa! what are those!!!

he twitches a little

(Y/N): I call them Gaster hands, they can be used as extra hands or I can fire plasma shots from them

Ruby: How do they work?!

(Y/N): *smirks* Maaaaaaagic

*(Y/N)'s POV*

she didn't seem satisfied with the answer but I was getting off track and I remembered why I came here but it was getting dark and I needed a place to stay and some food.

(Y/N): Do you know any place I could stay, I don't have a home

Ruby: awwww you poor thing, well we can ask Ospin

(Y/N): who is Ospin?

Ruby: He is the headmaster of beacon academy

(Y/N): (In your head) hmmm he sounds like the guy who can give my info on were I am

(Y/N): ok then lets go see him

before we start walking I quickly ask

(Y/N): Oh I Didn't get your name

Ruby: My name is Ruby Rose

(Y/N): Ok then lead the way Rosebud

Gaster: Rosebud?

(Y/N): *whispers* It just came to me! so don't start talking about it

Ruby: Did you say something?

(Y/N): Nothing! lets Continue

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and that's all for the first chapter folks

Gaster: see ya in the next chapter

Gaster! what are you doing?!

Gaster: testing my fourth wall breaking skills

Please don't keep doing that

Gaster: no Promises