Well I don't cosplay, I want to but I haven't been able to find an Envy outfit yet.

But I do write fanfictions, make videos, and does collecting pictures count?

I am going to be cosplaying soon as Mustang, I've already gone as Pride but military uniforms take longer to make.
I also write fanfics. Does having merchandise count as collecting? I've got the DVDs, the manga, Colleen Clinkenbeard's autograph, and Ed's pocket watch

Well, mostly I write a fanfiction, but I also have a few memorabilia.

I'm gonna try writing a Lust fanfic.

I only have one AMV for FMA so far. (It has clips from both series because it was hard to find Brotherhood clips that didn't spoil the ending) Check it out on youtube sometime, (It needs more views, only 11 last time I checked TT.TT) just ask me and I will give you a link.

That is if collecting the manga counts..

I buy merchandise lol. And constantly watch AMV'S ( i really need to learn how to make one) and obsessively think about it, and write fan fiction.