You were a test subject from Hawkins National Laboratory. You were the last one actually, you were known to be 012, had the tattoo on your wrist
You were the last subject and only one year younger than Eleven herself, you and Eleven were close, she treated you like a little brother like she treat Eight like a sister, cause you were like siblings.
But that change one day, where you hid in the lab and was about to escape, but you hear screaming, you see One 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. Eleven entered the Rainbow Room and watched in horror as One finished killing Two. One explained himself to Eleven, telling her of his origins and philosophy; he asked her to join him in his goal to eradicate humanity.
But Eleven refused. She used her powers to fling Henry into the wall; angered and disappointed, One stood back up and outreached his hand, with Eleven doing the same. The two test subjects engaged in a psychokinetic duel, with initially overwhelming and almost killing Eleven. However, Eleven, finding strength in a distant memory, ultimately overpowered One, pinning him against the wall of the Rainbow Room. She began disintegrating his body, but somehow, she opened an interdimensional gate in the wall, through which One was transported.
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After a while, you and Eleven ran away from the lab and escaped where you guys met some friend group, weird three kids, Mike, Lucas and Dustin, they were looking for their friend Will, he went missing and needed help, Eleven stayed a bit quiet and didn't understand much cause of her powers, anyways, you both helped the boys.
As you guys tried to find Will, you and Eleven found him in the Upside Down and saved him, poor guy was traumatised and tried to be himself.
Somehow you fell interested in him and became friends with him and Will was a bit hesitant but he agreed.
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After years, a lot of things happened, and I mean a lot, you were adopted by Steve Harrington and were known to be his little brother.
But anyways, let say Mike Wheeler don't like you, he think your like another Eleven and he can't really stand you, he just don't like you cause you have powers like Eleven and prefer Eleven and I mean you shouldn't like him as well cause he Will crush.
You somehow you like Will but in a way how Eleven likes Mike, it strange cause you always see Girls and Boys but no Boy and Boy or Girl and Girl, it was confusing but let say you are to confident to care cause you like Will.
And the other boys, like Dustin and Lucas they really like you, but since Mike is the leader, you wasn't allowed to join the group but they let you play D&D with them and they always invited you.
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Anyways, One day Steve was going to a party, so you thought it was a good idea to go to the Byers- to see Will ofc, and when you were riding your bike to see Will, and once you got to his block, you see his lights out, it was 5 pm. But once you got to the door and knocked, you found out Will wasn't home.
So you went to the Wheelers house, and ofc Karen let you in and when you went down to the Basement, you see all the boys playing D&D and Mike using your character to play.
You started to argue with Mike,but then Mike snapped at you "Well, we don't want you here! Okay!? Your not El! Your just a knock off!" he screamed at you, you want to yell back, but you ran off outside, you was about to get on your bike but Will chase after you, the thing was Will don't like you how you like him, you wanted to keep him company tonight cause Mike might be with El and Lucas with Max.
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Will rush outside to you with an upset look, like he feels bad for you, he catches up to you in his silly wizard outfit.
"{{user}}-" Will calls out as he rushes out and stands in front of you, blocking your way. He didn't want you to go cause you guys were friends, and you understood him.