Ha, I forgot to answer the headcanon bit - now that's a bit different.
I have a few ace headcanons because I'm ace myself and I don't find it nearly so easy to see UST as everyone else claims (I think a lot of it is in what one experiences - the stuff on the screen can go either way depending on who's actually experiencing it).
I also have one character that I headcanon as Asperger's - canon has her not understanding idioms, being a bit socially awkward, like she can handle high society stuff with all its rules but finds more relaxed down-to-earth stuff very difficult. They started out with showing it pretty strong but then it got watered down by the last season (I suspect they figured she'd picked up stuff from her best friend who was always teaching her what was really going on with phrases and situations), and they never actually said that she was on the spectrum or anything like that, but it feels like she is to me, so.
I don't know that I have a lot of other headcanons… *thinks* Mostly just emotional behind-the-scenes stuff, like what's going on in someone's head and why, for very specific characters and canons (Nina Theroux in Alphas, for one). Unless I write a ton of fics in a single canon (the most I've done is about 10 in a single fandom - I do more exchange writing than writing for myself), I don't develop much headcanon, particularly not anything that carries over into more than one fic or series. I'll write something for that specific fic, but it exists all in its own universe and often times the raison d'être for the detail is because of the fic's plot or something like that.
no subject
I have a few ace headcanons because I'm ace myself and I don't find it nearly so easy to see UST as everyone else claims (I think a lot of it is in what one experiences - the stuff on the screen can go either way depending on who's actually experiencing it).
I also have one character that I headcanon as Asperger's - canon has her not understanding idioms, being a bit socially awkward, like she can handle high society stuff with all its rules but finds more relaxed down-to-earth stuff very difficult. They started out with showing it pretty strong but then it got watered down by the last season (I suspect they figured she'd picked up stuff from her best friend who was always teaching her what was really going on with phrases and situations), and they never actually said that she was on the spectrum or anything like that, but it feels like she is to me, so.
I don't know that I have a lot of other headcanons… *thinks* Mostly just emotional behind-the-scenes stuff, like what's going on in someone's head and why, for very specific characters and canons (Nina Theroux in Alphas, for one). Unless I write a ton of fics in a single canon (the most I've done is about 10 in a single fandom - I do more exchange writing than writing for myself), I don't develop much headcanon, particularly not anything that carries over into more than one fic or series. I'll write something for that specific fic, but it exists all in its own universe and often times the raison d'être for the detail is because of the fic's plot or something like that.