The Mystery Kids meet The Interns
aka who they'd all get along best with
Sam Mabel and Neil are instant best friends. They're all weird in the same way, i think they'd just instantly click. All three of them are just on the same wavelength. Her and Norman get along better than anyone expected. Norman can recognize a fellow weird kid when he sees one.
Adam and Dipper actually really enjoy hanging out together, despite them both taking a bit to warm up to each other. (Adam thinks Dipper is a bit too young for them to have anything in common). Once they both find out they like history/cataloging weird occurrences, they end up spending hours swapping notes. He's friendly to all of them, but isn't friends with them in the way the others are. He's a bit too old to hang out with them (with the exception of Dipper bc he's cool) (like in the way a high school senior hangs out with the freshmen). He's very charmed by Mabel and her grappling hook, and shows her yo-yo tricks.
Lizzie and Coraline are instant besties. (they both have blue hair and pronouns). Their personalities would mesh really well, plus Coraline probably reminds Lizzie of a less annoying Norma. Lizzie and Mabel also get along, much to Dipper's annoyance. (he's desperately trying to be friends with Lizzie and Adam bc they're cool older kids). Lizzie thinks Mabel is really fun, and they end up DIYing clothes together.
Gisu and Wybie get along really well after she finds out Wybie also likes engineering and tinkering. (they build so many unsafe machines together). Gisu finds Coraline annoying (a bit too much like Norma), but tolerates her bc she's friends with Wybie. Gisu also gets along well with Mabel and Norman (i don't really have any basis for this, just vibes). She likes talking gadgets with Dipper, but that's about it. Gisu bullied Neil (and everyone else too) at first, but quickly warmed up to him, and now they're pretty good friends.
Morris also gets along well with Wybie (they became friends through Wybie hanging out with Gisu). He makes a genuine effort to connect with Coraline (he thinks she's cool in the same way Lizzie is). Coraline bullies Morris in the same way she bullies Wybie (lovingly, that is)
Norma is (unwillingly) befriended by Mabel (mabel sees her as another pacifica). She tried to be friends with Coraline, but they both have the same type of abrasive personality, and it did not click.