Hi! I'm Dena, and we've got a bunch on teams together, so I'm sure they'll know each other.
I've got Lexi, the youngest Barnes kid, over on the Outsiders. He's not at all magical and tends to find magical-based powers interesting, so he might like Jonathan.
And Fix is on the Avengers with Caroline. He's a Stark baby and his parental issues are more related to the "sometimes steals things like his mother" variety. But he's Stark-smart, so they might bond over brainy?
I've got two over on the X-Men, Figment and Outburst. Of the two, Outburst/Nicci is a not-quite-really-on-the-team-yet junior member and I think she and Daisy might like each other? Nicci can have an attitude too and kind of appreciates it in other people.
Caleb is over in the Heroes for Hire with Stinger. He's the younger Cage sibling and follows Dani's lead, and is easy going and friendly so will probably love Hank.
And Lulu's with Carol on the YA. She doesn't do fic, but she can totally fanglee over real heroes that aren't related to her, so they should be pals! YA is a small club anyway, so I figure they're all pretty close.