Teen Wolf
Fem!Stiles
Magical/Spark!Stiles
Fairy/Fae!Stiles
Stiles x Derek
The actor I am thinking about for playing female Stiles, is Leah Blem (19 years old), the girl named Jess from the Coca-Cola commercial.
Stiles has been masquerading as a boy for a long time, her family insisting that it would be safer.
Sheriff Stilinski (let's name him John like the rest of the fandom), married into the Stilinski family when he married his wife Claudia.
The Stilinski family all gather together every July for the entire month to 'Mourn, Celebrate, Remember, and Learn Anew', at the family homestead up in rural Canada (?). The family land is in the middle of nowhere, and while there is modern plumbing and electricity, there is no internet or phone service (the only phone is a landline out at the end of the long drive next to the mailbox). The closest town is an hour away, and not that big.
When Claudia died, Stiles, expanded on her one-month family vacation to her whole summer vacation. Because now she was the heir, and she was just coming upon that age where her powers would emerge, and her father thought it would be best to learn control early, and spend time with a woman to look up to and to have a woman look after her.
Stiles and her grandma are extremely close now because of this.
Whenever Stiles (real name Genim?) is at the homestead, she looks like a beautiful girl, like her true self. And well since her grandmother is old fashioned, she wears dresses and long skirts a lot.
It was her grandmother that helped her 'cloak' herself so completely, to make her look and smell exactly like a normal human boy/male would. And that is why no one not even Scott realizes that she's actually a girl.
(Stiles did want to tell Scott before they entered high school but her family talked her out of it, since the boy was neither her kin or her other half).
Even though Sheriff Stilinski isn't a fae/fairy, just an aware human (thanks to Claudia), Stiles is still considered a full-blooded Fae/fairy (the blood doesn't weaken between human and fae/fairy, only when it's mixed with another creature, which could actually strengthen it sometimes).
This story would be for the most part canon compliant, at least with most of the events, since Stiles is in actuality a girl (not that anyone besides her dad will know this till later), and for the fact she disappears from Beacon Hills every summer.
Stiles' mom used to be the one to disguise her.
The only real method of communication that Stiles has available is sending a letter.
I feel like Stiles should have a power that allows her to 'know' things, kind of like Peter Whitlock from Twilight. An ability that isn't quite seeing the future, but similar in a way, but also allows her to know things about the past or present, about a person or place, and sometimes it will tell her things about to come or far off in time.
Possible Timeline
*High school lacrosse season is normally from March to May
*Season 1 takes place sophomore year, Season 4 is Junior year.
*season 3a, when Jennifer Blake appears, in a new school year, so Junior year.
*So seasons 1&2 are sophomore year and seasons 3a&3b and 4 are junior, since season 5 is Senior year.
*all seasons have them interacting in school at some point, so does that mean that the summers/holidays/vacations are left out?
-1998, Derek is born.
-main cast (Scott, stiles, Lydia, Allison, Jackson, Kira, etc.) born in or around 1994.
-November 7, 2003 Derek turns 15.
-Claudia dies in 2004 (Stiles would be between 9 and 11, depending on birthday).
-hale house fire is 2005, depending on the month Derek is either 16 or 17.
-canon events start January 9th, 2011. The next day is the first day back to school (winter holiday? Or another short holiday?).
-Friday, February 8th is the winter formal dance. {S.1 ends}
-jumps to a few days later
-Saturday, April 8th, Stiles is kidnapped by Gerard. Erica and Boyd go missing. April 9th, the Hale pack finds the alpha pack symbol {S.2 ends}.
-jumps to August
-Tuesday, August 14, the first day of Junior year.
-Thursday Aug.16th, it is determined that Erica has died. Friday, August 17th, Cora is introduced.
-Friday, September 7th, Boyd dies.
-Saturday, September 15, the lunar eclipse occurs, the next day new argent code is spoken, {S.3a ends}.
-jumps to October 9th
-Friday, October 12th Malia becomes human again.
-Wednesday, November 8th Stiles is put in Eichen House.
-Monday, November 13, Allison dies. November 14, Aiden dies.
-Monday, November 20 Derek is shot and captured, {S.3b ends}.
-jumps to December 13 (canon starts Wednesday, December 28th though)
-on the 29th Derek is returned to his adult body, but now with yellow eyes.
-Thursday, January 5, Scott bites Liam.
-Saturday, January 21, Scott, Stiles, Kira and Malia take the PSATs
-Wednesday, January 25, Peter learns he is the Benefactor, the dead pool computer is shut down.
-Saturday, February 4, the final showdown against the Berserkers, Peter and Kate. On the 5th Derek and Braeden leave, Peter is delivered to Eichen House, {S.4 ends}.
So, so far there has only been one summer vacation the entire series, and that was between Seasons 2 and 3a.
In this one Jackson moves to London, Scott and Allison take a break from dating (does she also go to France?), Erica and Boyd are captives (Cora is also a captive) of the Alpha pack, Isaac was also a captive but Braeden freed him.
So at most, the group might not really notice that Stiles isn't in town. Like Scott knows, but he occupies his time with studying and summer school (I think). Lydia I think might still be in that phase of only half acknowledging Stiles (she still thinks he's a guy at this point). Derek, Isaac, and Peter (maybe?) are focused on looking/finding Erica and Boyd. Both Allison and Jackson (who probably wouldn't have cared), are out of the country. So really only the Sheriff and McCall's know or care that Stiles disappeared for the summer.
Going off Stiles power/gift of knowing, and the letter communication thing I thought of, I feel like having the sheriff come back from his week with the family in July with some letters, which include the usual to the McCall's, (maybe one to Lydia and/or Allison, probably Allison is more likely), and a letter for Derek Hale (not that the sheriff knows that since they're bundled up looking like they're all for Scott).
Scott delivers the letters on Stiles behalf (he mails Allison's, or just holds onto it till he sees Lydia). Derek is surprised and confused, Scott explains that Stiles is always away for the entire summer to visit family, and that the letters are the only means for outside communication. Scott then leaves. When Derek opens the letter, he is surprised to see many sheets of paper, he goes through them one by one, some have only a few lines while others are pages long. Finally when he gets to one somewhere near the end, (he doesn't really read them just skims or something) a short one sentence one, he stops and stares at the sentence; "Sourwolf, check the bank vaults." (Or "I suggest you look into previous bank heist from town.") And he is confused by what it means, but he gets a feeling in his gut to listen and do as suggested. It takes him a while to find all of them and go through them even with Isaac's and Peter's help, but they think they finally make a break through.
Maybe Stiles also writes him to ask her dad about it (so that they could get access to the blueprints and such), in one of her other letters, which after that sentence caught his attention and gut instincts he goes back and reads through all of them.
When the Sheriff learns that Stiles wrote Derek, and about how the teens are missing and he has been looking for them (I imagine that so has the sheriffs department), and how Derek thinks that Stiles somehow gave him a clue. The sheriff believes him and states how in the pass Stiles has made a comment about something or other and it turned out to be very important. He agrees to look into what she said and will see what he can find and be allowed to give to Derek to look over.
Teen Wolf Idea
Fem!Stiles works (helps out) at the sheriff station, like maybe at the front desk, or with the filing? Errand Girl?