(Slightly base off He's My Man by Luvcat and your El)
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You were a test subject from Hawkins National Laboratory. You were the last one actually, you were known to be 011, had the tattoo on your wrist.
You had a sister 008, and you both were separated even if you not blood siblings and even kids in the lab were your siblings.
But you heard screaming, you saw 001 was going on a murderous rampage throughout the laboratory, killing all the other test subjects and various Hawkins Lab personnel, and indirectly knocked Dr. Brenner unconscious. You entered the Rainbow Room and watched in horror as 001 finished killing 002. 001 explained himself to you, telling you of his origins and philosophy; he asked you to join him in his goal to eradicate humanity.
But you refused. Making you used your powers to fling Henry into the wall; angered and disappointed, 001 stood back up and outreached his hand, with you doing the same. The two of you test subjects engaged in a psychokinetic duel, with initially overwhelming and almost killing you. However, you, finding strength in a distant memory, ultimately overpowered 001, pinning him against the wall of the Rainbow Room. You began disintegrating his body, but somehow, you opened an interdimensional gate in the wall, which 001 was transported.
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November 6, 1983. Hawkins.
Young Will Byers is cycling home from a disappointing Dungeons & Dragons campaign at a friend's house when a terrifying figure suddenly appears... Will tries to escape and hide, but he is abducted...
Will's friends Dustin, Lucas and Mike begin investigating his disappearance; while looking for Will in the local forest, the boys find a you with a shaved head in a hospital gown, who they let stay in Mike's basement. They learn your name is 011 and that you have psychokinetic abilities.
You prove Will is still alive, manipulating several radios to project the sound of Will's voice.
But anyways, that was years ago, you vanish and came back and reunited with Mike, and you both start to date, as well you also met your mum and 008 but came back.
Aswell after that, Mike became possessive over you after all that just cause he "don't want to lose you" well he obsessed with you.
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Timeskip.
You saved the world as well, broke up with Mike, then got back together , and that made him more possessive. Man can't learn his lesson.
Aswell, you had to leave with the Byers family leaving Mike back in Hawkins as you went to California, and you got bullied. Then Mike came over to California, and Joyce found out Hopper was alive, as well as you had an argument with Mike about him not saying "I love you" through the letter.
Then you got taken again by "Papa" and then found out 001 is still alive and he the reason for all of this, and you had to save Max and she ended up in a coma, she was your bestfriend.
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(AU where you defeat Venca)
It been eight months, and you been staying with Mike, and the Byers stayed as well, and Hopper been building a house for Joyce cause they are dating.
As well, you have been getting nightmares of Mike being like Papa- making you stay with him aswell making you be friends with Lucas and Dustin or just making you be friends with his friends and just that.
He hates when you disobey him, like if Max was here, she would push your confidence back up, but right now - you only have Mike, even you hear Mike argue with his friends.
But change one day, you left to see Max in hospital cause you couldn't stand it, so you just took his old bike and ride to the hospital and that when you met Lucas there comforting Max in her coma.
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Mike sat in the hospital chair outside of Max's room, and he looked up at you stern and upset at you. He hated seeing you outside.
"What are you doing here!?" he looked up at you, upset and frown, he clench his fists onto the arm rest. He couldn't stand it, he just stared at you coldly, no one would understand your relationship, you were his girl.