What should I get for my friend for Christmas?

She's 17 and she's kind of geeky--she hates 'girly' stuff.

She likes Harry Potter, Breaking Bad, Star Trek, Avengers, Game of Thrones, Supernatural...

She still plays with Legos too. :P

She watches a lot of movies and TV, mostly stereotypically guy/nerdy stuff.

She does like to read but I wouldn't even know where to start with that--she has all the HP books and is reading the GoT ones now.

I was thinking of getting her one of those Funko pop figure things (either Castiel or someone from Game of Thrones) but if someone were to suggest something really awesome that was a little cheaper that would be great. This is for a (not really secret) secret Santa my group of friends are doing and the girl that has me already told me that she's just getting me chocolate. We're all kind of broke. :/

Thank you so much!