Let's see my Geekdoms are...
Well, I'm an 
Otaku first and foremost. One with 
good hygene, that doesn't dress like a character that I should 
never dress as, but an Otaku none the less!
I'm also a 
Movie Geek, but I'm the "elitist" kind of movie-geek that doesn't like the same movies as everyone else.
I'm a definite 
Comic Geek, but I never really got into "Superhero Comics". I read pretty much everything else.
I tried to get into 
Table-Top RPGs but my friends just weren't into it. So, I had nobody to play with. (BTW you forgot Card-Game RPGs)
And, (are you ready for this) I am, and I will freely admit it, one of those dreaded 
Fan-Fiction Writers you mentioned! In fact, 
here's my profile, which reveals a whole lot of other geeky interests. I do 
NOT write "self-inserts" however. That, would just be a little too far into the abyss.
BTW Furries may be geeky 
now, but what about in the future after they perfect genetic engineering (allowing them to actually become anthropomorphic animals!)?