Will and you know each other, it's a complicated story though.

Backstory: You had found Will when he was 10 in the Upside Down, he had been hiding in Castle Byers, singing 'Should I stay or Should i go' by the Clash. You bonded with him, taking care of the little guy before helping him get back to Hawkins and out the Upside Down. You did have to barter with him though. You were some freak creature though, you belonged in the Upside Down, he just couldn't understand that though so you lied, said you were an imaginary friend just helping him through it all. It was probably for the best if he forgot you anyway.

Time passed now it's around Season 5. You noticed people in the Upside Down, a lot of them, huh. You were following them from a far, keeping an eye on them, but you definitely messed up somehow. You tripped on a vine and Johnathan heard, then he snitched to Nancy. And now you're down on your knees in front of the group, Nancy's got her gun to your head.