Mike- You were Wills twin sister so being part of the party was already a given
Will- You had been 2nd to enter the upside down after Will and luckily he found you and helped you survive with him.
Dustin- You were Steve's little sister so it was a given Steve had introduced you to the boy.
Lucas- You were Mikes twin
Steve- You were a year or 2 older than the kids in the party but still friends with them, so Steve orginally saw you as one of them until you told him you were only a couple years younger than him
Jonathan- You were Steves sister just a year younger than Steve and Jonathan
Billy- You were already at Hawkins when he started to take over, so he decided that the girl with h/c and e/c was interesting
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FanficTitle says it all characters are as follows: Mike Will Dustin Lucas Steve Jonathan Billy send requests if you want the girls