Clarke Caine was called many things by her parents. Ticking time bomb was the nicest. Disease was the worst, shouted by her father in one of his rages. You're a goddamn disease, he yelled, then he'd turned to her mother. She's a disease. And it's terminal.
Of course, he died a few months later, killed by none other than Clarke herself, because Clarke was death incarnate, and once she began, there was no stopping her.
Okay, so Clarke is a Reaper or some other kind of supernatural creature. Reaper is what I came up with off the top of my head.
Maybe a Valkyrie? Anyway, she's something. She has a death power- she can cause death by the slightest touch, but she can't control it. That's what her dad means when he says she's a disease.
So she kills her Dad (who's a bit of a douche) and then later, at 16, kills her mum too. Then she runs off, seemingly randomly, and of course ends up in Beacon Hills because of the power of the Nemeton (Misspelled whoops). And yeah. Shit happens. She finds a love interest, who's some kind of supernatural creature (sorry, no Stiles) and when they're kissing almost kills them, but because they heal so fast, they're okay.
Possible Faceclaims:
Caity Lotz
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Danielle Panabaker
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Sasha Lane
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Lindsey Morgan
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Again, I'd like to stress that you can choose whichever faceclaim you want. These are just ideas; although if you choose Nina Dobrev I will actually shoot you.