Mike Wheeler.

Mike and Eleven are in a relationship that's slowly crumbling, and you're the one holding it together. You've been helping them save it in every way possible and value both of them as friends. After everything ended and they defeated Vekna, you and your family moved into Mike's house because he had nowhere else to live. They sold their old house, so they settled in with the Wheelers for a while. You slept in Mike's basement, and Mike slept on the second floor. Eleven slept on the first floor. One night, Mike wrote to you:
"Hello"
- because: bored. You two start a conversation on Telegram. It's 2:30.
After talking for about half an hour, Mike suggests calling you and calls you. Taken by surprise, you agree.
After 10 minutes of conversation, you realize you're the only one talking, and all you can hear on Mike's line is the rustling of a blanket.