Book recs if I liked stranger things (found family aspect, YA, adventure, etc.)

Hi!! I’ve been obsessed with stranger things ever since it came out and I’m wondering if anyone has any recs based off of my favorite aspects:
– found family (bonus points if these characters are likeable..)
– unlikely friends or partners
– sci fi, adventure
– young adult characters
– some sadness here and there
– (this is optional) romance subplots … but not unnecessary love triangles!!

please let me know if you have any recommendations even if they don’t cross a lot of things off here! I’m open to anything remotely close 🙂