option three sounds a little like the best of both worlds!! it all stays in one place, with an established user-base + relatively peaceful atmosphere (thanks to the all-powerful, all-wonderful mod) but it won't alienate the users who are here solely for daredevil. separate posts for the separate shows makes it a breeze to find what you're looking for. for jessica jones-centric go here, for daredevil-centric go here.

crossovers are a grey area in terms of organisation and it's never going to be easy to definitively rule on where a prompt should live so maybe: a post for dd, a post for jj (posts for the others when the time comes) and a xover/defenders post for prompts that can't be classed as one particular character-centric.

but in saying that i have no idea how dreamwidth works and all of that might be too much work, i'm not sure just thought i'd float the idea :-)