For Eve I adapted a murder-mystery plan I already had in mind for my attempted Batman proposal (a re-imagining of the rogue 'Magpie'), and just threw in occult spooky stuff instead of gritty street-level stuff. Then as I was writing the sample, and then the first and second post, the background details crystallized as I jotted down ideas and then that formed what is now the base background plot behind the arc; then some more ideas turned into this loop concept I've got going now, and everything kind of came together for a really solid narrative I could tell. The writing of the posts themselves is very improv, though - I know the rough beats I want to hit, but don't plan the post so much, just write it then proof-read and tweak a little bit before posting.

My Constantine story I've been trying to tell is [i]very[/i] planned by comparison; I have a googledoc of a bullet-pointed list of the entire arc, with each character's place and plot explained and notated and the sequence of events that occurs with all the background plot behind it; then each post itself is crib-sheeted before writing, where I short-hand where the post starts, where it goes, all the beats it needs to hit, and where it ends and how it leads into the next post; then I take that crib-sheet and expand it into an actual post, each one sentence in the plan equalling maybe 1-3 paragraphs in the post itself. Even in that instance, sometimes I end up altering the plan while writing the post when where what I wanted to put in doesn't actually quite fit with the direction or tone the actual post has taken, so I chop it and find a way to include it later, or make some quick rewrites.

I guess I'm a planner for arcs but a seat-of-my-pantser for posts? I've always found the conceptualisation of a plot easy, but converting my seemingly-scattered thoughts into linear prose that follows the traditional narrative arc tricky. I nearly always have a solid over-arching story clear-cut in my head, but rarely have detailed, [i]written-down[/i] plans. If anyone ever invents a device that reads minds and converts thoughts into organized prose, I'm becoming a bestseller.