1. As pretty much an only furry enjoyer, I'll leave this question for others :p

2. I always imagined it as being super bright, happy, and full of opportunity. In fact, one of the things I always pictured was her as an aspiring musician, like someone who would play the violin or viola or something. She was primed to go to a super upscale university, had options lined up for being a star performer, everything. Of course, that all changed when she had her accident(s) which have left her encased, immobile, and alone for 4 years and counting. For some reason I also imagined her having a sister she was super close with, but after the accident she started visiting Willow less and less over time, just like the rest of her friends and family.

3. As for her accident? 100% it was a massive, almost never-ending series of cartoonishly over the top brutal shenanigans. I think you and I even talked about this before. But yeah just stuff like falling down a hill into active traffic and getting bounced around, before it causes a pile-up that causes a massive semi-truck to land squarely on top of her. And by the time the EMTs are able to pull her out of the wreckage, her own ambulance ends up running her over too. They air lift her out only for the helicopter to be holding her stretcher too low so she hits the tops of every building and tree along the way, they get her to a hospital room only for it to be the wrong building that was actually scheduled for demolition that day, etc. I also read a good cast story once in which a woman is handed the leash of a massive great dane dog, and it sees a cat and begins chase, dragging her body behind it as she smacks into every passing car and object. And after being hospitalized, the same thing happens all over again with the dog completely on accident dragging her broken casted body all throughout the hallways and streets until she looks more like a clump of dirty rags than someone in a full body cast. Whatever happened to Willow I think it should 100% be a lengthy series of events rather than one thing. And who knows, maybe someday there could be a Willow story in which she gets into ANOTHER accident while she's already casted? Could just be a non-canon side story though lol

4. Future stories? I think one of your unfinished story fragments had some interesting potential, where Willow gets a review that discovers that her condition is actually deteriorating, with her ribs and eyesockets fracturing and the doctors can't figure out why. I think it would be a cool twist to reveal that the cast she has been literally entombed in is just so bulky and heavy that it's making things worse. The "No healing even after 4 years" is 100% just her natural body, like that would be the case either way, but her cast being as bulky as it is is literally making things worse and more fractured. The doctor's cure? Obviously a bigger and more rigid cast with lots of metal bracings and such. Oh and of course you could also go the route that I mentioned in my previous pointer of having her somehow getting into another accident or something. I feel sort of bad about it, I know that half of what some people enjoy about cast fetish is the wholesome aspects of getting better, like Willow being moved to a bigger, more well lit room with more people to interact with, so on and so on. But I can't help it- I love seeing scenarios get more extreme even when you think it's already reached a peak x3

Sorry for yappin', excited to see what you have in store regardless!

Should she be walking on that foot of hers? With those fixators?

bit late to the party, but my headcannon is that she stepped on a banana peel to prove that they don't slip. did not slip, started to walk away, stepped on the peel again and fell down a few flights of stairs.