Christmas Present for Anime Loving Girlfriend :D

[Remosaic]

I decided to be as thoughtful as possible and consult this wondrous forum.
I want to get my girlfriend something thoughtful. (rather than the typical perfume and cozy blanket)
This could almost be considered a brainstorm. I want to see what kinds of creative ideas you guys could come up with.

I'll give you guys some of her interests and let you run from there.

Her favorite animes are:
Death Note
Black Butler
Hetalia

Also loves most all Hayao Miyazaki films.

She loves writing. (This was her 3 year completing Nanowrimo)

She plays piano, violin and sings.
Loves internet memes.
Her favorite house is Slytherin xD

Go crazy Friends!
PS. I'd LOVE if I could make her stuff for Christmas but am also willing to buy extra special gifts.
Edit: I'm looking to spend around $100.
She just recently bought a mario hat, and a new cosplay costume that she refuses to show me right now >:C
She has a 3DS and is a huge Zelda, Harvest Moon, Fire Emblem and Final Fantasy Fan.
Her personality is very....hmm, troll like. Dry humor. xD