1. How many people can claim a character or pairing? As many as want to. There's no limit to how many people can take a claim.
2. Can I write with a partner? Yes. If you're interested in doing a collaboration, you could sign up jointly with another person. The collab team can only write 7 fics.
3. Can I claim more than one character/pairing at a time? No. However, once you have completed your first set, you are welcome to claim a different one.
4. Can I claim a crossover/original character? No.
5. If I pick a pairing, does every piece have to have that pairing in it? Not explicitly, but you should at least allude to it.
6. How are you going to know if I've already written like, a kajillion Roy/Ed fics and then claim Roy/Ed here? I'm not, and honestly, I don't care. If you really want to add to the pile, go for it.
7. Can I repost old (by "old" I mean completed before the date you requested to join) fanfiction for the prompts? No. If I find out somehow that you've done it, I'll delete the post. But then again, I'm not going to be arsed to comb your journal to see if it's been posted before.
8. Can I edit/reassign prompts for previously posted fics? Sure. Just go back to your post, click "Edit Post" and switch out the prompt.
9. Can I claim a group of characters (e.g. the Military, the State Alchemists, the Sins, the Chimeras, Xing, etc)? Certainly.
10. How long to the fics have to be? At least 100 words, but they can be as long as you want.
11. What ratings/types of fic are allowed? G through NC-17, and anything you can think of, from fluff to deathfic.
12. Are there any deadlines? No. Just... before I go senile and incontinent, okay?
13. Can I post fics that I'e written for this elsewhere? Repost whereever you want. It's your fic, after all.
14. Can I use fics I've written for other challenges? Yes, as long as it fits into the specification of "new fic," which is, you wrote it after you claimed your character(s) here.
15. How central does the prompt have to be to the fic? Don't stress it. Use it as inspiration or for an added dimension. Hell, just stick a random prompt onto a fic. I won't be able to tell.
Still have questions? Comment here and we'll answer them as quickly as possible.