I started a vast dissertation in response to your points and wants yesterday but deleted it because anything written while tired is unrecognizable slop. Thank you in advance as I address these in order of listing.
Minor things:
1.) I'm going to readapt the movie length premier, less word for word as I justify the existence of my additions to the cast. I agree that Wil and Xander should mention their bestest friend since they were five just getting off'd, that has affects on people!
2.) I'm writing Wesley on the lower side of thirty but above his teens, putting him at 25. Old enough to be 'an adult' and young enough to still be naive without it hiding malice (because he's malicious, sure, but later, in AtS)
3.) Will do, you'd think that people just up and dying would have more of an affect on people who've known them for years!
4.) I like catching the moments between most of all because it allows my imagination to well, imagine.
Plot points:
1.) We as fandom agree (or disagree) on Faith's backstory because of
Go Ask Malice. I'm not sure if I'm going to contradict that majorly or not yet. (I mean, I'm gonna contradict canon pretty directly a lot so we'll see).
2.) I'm gonna have fun with the Initiative. I'd already dropped a few hints that my Sunnydale isn't quite the same as Sunnydale from the series and that'll be a bit more pronounced going forward. Tying the army to Marcie is (imo) more interesting than the FBI showing up (for that proper thriller feel it should've been the agency).
3.) Vaguely school until I figure out something for her to do. Medical school less so, might play with 'got into Oxford' more.
4.) This is something I actually thought about doing to empathize that while it'll be a familiar story it isn't the
exact same story but with a wrench or fifty in the works and if it's different, shouldn't it
be different?
5.) The Watchers' Council as a whole I plan to be both a bit of a malevolent 'joke' (these people torture teenagers! To death!) whilst simultaneously about as threatening as a chihuahua that doesn't have teeth outside of very specific circumstances. You are correct we know very little about them, which is what makes it fertile ground for both sinister
and hopeful plots. Personally I find there are few greater evils than the nebulous greater good, and the horrible things people will do to one another in the name of moral rightness, made worse by the fact the council knows there are monsters in the dark.
Things I'll try to avoid:
1.) I outright angst over mischaracterization, I promise I won't, at least not deliberately.
2.) There are two canonical Halloween episodes,
Halloween which I'm adding a character to, but no costume changes for the ones you know, and
Fear Itself which my plans for right now are 'I'll cross that bridge when I get to S4'.
3.) Indeed, Buffy doesn't. I'd planned on something like that, though I'm not telling it from her perspective alone (or even primarily as I fear fucking her up most of all so I write her as little as possible...)
3.5) I agree and some of the minor characters (esp. the recurring ones) will be addressed.
Overall this is still an OC forward story and it'll stay that way (adding people to the cast is like a time honored/reviled tradition in the buffyverse fandom) but this gives me a lot to think about without contradicting that and thank you again.