My name is Anne and I'm excited to see a Natasha! :) It devastated me on many levels to see Nat die (I'm not over it...even more so than Tony, but don't tell Frost I said that). She's amazing and this is the perfect place for her after that horrible event (I think).
I play four characters here so far, but only one is a canon-mate for Nat.
Carol Danvers (MCU): Carol comes in right after she was trying to return to Earth when Fury paged her. Unfortunately, she would have not met Nat yet and doesn't know the rest of the Avengers beyond who she's met here. She's pretty much the same slightly snarky bad-arse you know in love, but still hast he long hair (for now). She's protective of people and runs the town bar with Peter Parker (Spider-Verse). Kind of a weird/long story htere, but I imagine Carol will immediately like Natasha and want to help her out in whatever way she can.
Doctor 13: No idea who Nat is, but is fascinated by all things time/space and has recently started talking al to MCU Tony. She'd be interested to hear about the Soul Stone and what Nat knows about this gauntlet and the whole Thanos sitch, especially since she was farther along in it than the others.
Miles Morales (Spider-Verse): He knows Natasha from his universe as a legendary Avenger and will promptly fan-boy over her a little. He's an awkward teenager, just learning about his powers. So there's that.
Obi-Wan Kenobi: The infamous Jedi, he just got to this place and is trying to figure things out but he's a hermit so not sure how much he'll interact with other new characters...yet. Hopefully, we'll find out.
Let me know if you want to thread or plot, I'm always open to ideas. Just excited to have you here! :)