Tws: childhood trauma, mention (no description of) child abuse, siblings being separated / taken away from parents, parental death
Disclaimer: I'm a System myself, so any talk about DID/OSDD1 here is based off my experiences and adjusted to fit a fantasy setting. This may not match everyone's experience with being a System and I'm sorry if it doesn't match yours or you don't feel it's accurate enough.
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Okay, so my Take on a Human/Vampire AU right?
N & Cyn:
N and Cyn are biological siblings. Their birth parents were not good to them. Cyn (not her name at this point) does develop DID because of this as a young child.
A conflict happens in the family and N gets separated from his sister. They lose contact. N has always been her safe person and safe space, so this experience is extremely stressful and traumatizing. This results in the system splitting a factive Introject of him. "N"s job in the system is to take care of the body physically and emotionally when need be and to be a comfort to the other alters (Caretaker/Caregiver/Soother, Emotional Protector). Aside from "N" there already were two other alters before him.
C & Y.
C is a Protector/Avenger and Gatekeeper, she typically deals with conflict and arguments and is more outspoken about things. However, if a situation requires them to seek a hiding spot for safety she will opt for that as well.
Y is a trauma Holder and little who is stuck at the time of the trauma, meaning they don't age up and are forever the age range the body was during the trauma / when the trauma started.
Throughout the next 1-2 years there are two more fully formed alters (the system probably has fragments that aren't as developed too, but I'll only touch on the alters that matter for the AU story).
Cyn & Solver.
Cyn picks her name based on the three alters already existing, She is the new host of the system (prior there wasn't a clear host). Cyns Identity also is what the system uses as their "Singletsona".
Later on the body gets infected with the vampire virus. How I still need to settle on, but I am tempted to make the parents neglect and abuse part of the cause.
The process of turning is painful and traumatic, and Solver splits. In the headspace, Solver takes the form of the body as a vampire.
Solver is a Persecutor (under the definition misguided protector - harming the system and its surroundings as a form of protection).
They and "N" tend to co front for making sure the body feeds, "N" because it's part of his Caretaker job to make sure they eat and drink & Solver bc they're the only alter comfortable with the whole Vampire situation.
Eventually Cyn finally gets taken away from her abusive parents and the system ends up in an orphanage.
Here they socially officially change their name to "Cyn", wanting to separate themselves from their past life and self. The only thing they don't want to forget is N, and they haven't heard from him since they were separated.
Until one day the Elliot Family comes to the Orphanage - or well, the parents and two of their kids. Tessa and their adopted son.
Said Son and Cyn make eye contact and recognize each other as N & his little sister. N pulls his adoptive parents aside and points to Cyn, telling them that he's pretty sure that's his little sister.
After some confirmation, both between the siblings and also with official documents, the family adopts Cyn as well, reuniting the siblings!
It seems fine until the vampire situation becomes an issue. The family doesn't know. The secret and whole vampire thing in general puts stress on the system.
Solver fronts to feed, and ends up feeding off and infecting N and V. Another night it happens again with J. (Harming the body as a form of protection in this case; making the system feel more ashamed and guilty about the vampire situation to be sure they won't tell someone who could actually hurt them.)
N, V and J after turning make sure to keep Cyn fed so Tessa and the parents never get turned.
Also technically Cyn isnt aware of the system beyond thinking the alters are "imaginary friends". Mainly bc many systems dont figure it out until they are much older so I feel making a kid aware of it would be a little inaccurate. Not saying it never happens but still.
N does take note that Cyn sometimes acts "off" but puts it down as not having seen her in 2-3 years and her probably having experienced more trauma since, not to mention the vampire situation once he learns of that.
Uzi:
Uzi lives with her single father Khan. Her mother died when she was really young for reasons Uzi doesn't know of.
Nori was a vampire, however Uzi doesn't know this. Uzi did inherit the virus but it is dormant and inactive.
Uzi is kind of an outcast at school, bullying and all, ever since she can remember. The only person who doesn't really judge her is Thad who hangs out with her sometimes.
This changed when the Elliots adopted N and he switched schools, joining Uzis class. His friendly demeanor causes him to actively try to befriend Uzi, even tho she's more than happy just hanging out with Thad occasionally. Over time however N manages to worm his way into her heart and they become friends and she starts helping him with math homework.
(V, J and Tessa attend the same school but are in parallel classes btw)
They're friends for about 1,5 - 2 years when the whole Cyn reunion and vampire infection happens.
How Uzi finds out about this is still on the table but oh well. Also, Uzis own vampirism becomes active, turning her too. Now here is two ways I can't decide between this could have happened.
N has told her about having turned a vampire, due to suddenly avoiding places with lots of sunlight and preferring evening hangouts and sleepovers over their typical day/afternoon hangouts. Also he stinks of sunscreen lol. --- one time, N desperately needs to feed but they're in a situation where he cannot do it (be it they are at school or on a trip or whatever - he cannot go away to try and find some wild animal to feed off of) so Uzi offers him that he can gave some of her blood. He hesitates, not wanting to hurt her. She insists because he's visibly not okay and she trusts him. He promises he won't turn her (as vampires can choose whether or not to inject the virus into their prey) and they get a quiet corner for him to feed off her. Everything seems fine until the following days Uzi has symptoms of turning. N had kept his promise, but being bitten awakened her own dormant virus. She doesn't know this tho and accuses N of lying to her and purposely turning her. They argue and their friendship takes a huge hit. Uzi turns to V and J instead of him to ask about what to do and how to keep herself fed and relies on V for help on her first few nightly escapes to hunt. Uzi would shut her down whenever she brings up how guilty N feels and how he misses her. She's mad at him until eventually finding out about her mother being a vampire (still deciding how) and then realizing it's not his fault. She feels guilty for blaming him and thinking he would break her trust and she then does everything in her power to make it up to him. He's upset she would think he's lying and genuinely believe that for so long, but he's happy to have her back.
Option 2 is Uzi and one of the vampire siblings both being hurt. They patch each other up and Uzi notices their blood being black (a vamp hc ive had since I was a teen lol) and asks about it, finding out about the situation. However during the patching up of wounds, some of the black blood enters her wound which activates her own vampire virus.
One option for this is that Uzi hurt herself prior to helping N watch Cyn and Cyn gets hurt whilst N isn't in the room. Uzi helps her and in the process Cyns blood gets into Uzis injury.
[ I am open for situation suggestions with N, V and maybe J ]
J & V:
Dont have a lot about them except that J was adopted first, she's a little older than Tessa even. V was adopted alongside N from where they were in the same orphanage.
J doesn't like Uzi when N starts hanging out with her. V does somewhat get along with her tho and helps Uzi when her own Vampirism activates.
Tessa:
Tessa is unaware of her siblings vampirism for the most part. She did notice them seemingly eating less though and is a little worried about that, she makes them snacks she knows they like to try and make sure they eat enough.
I feel if anyone were to tell her, it would be N. And he wouldn't tell that it's all of them. Only him and maybe Cyn, as he can pass that off as "well we ARE biological siblings after all".
Idk that's all I got for now.
Also Nori was either
killed by Khan after he found out she's a vampire
Died due to extended exposure to sunlight
Killed by vampire hunters
Majorly injured by hunters or the sun so Khan had to take her out of her miserly
