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It's common for superheroes to show up in each other's comics, but their non-super supporting cast usually doesn't. So the Fantastic Four might show up briefly in an issue of The Amazing Spider-Man, but their mailman Willie Lumpkin never does.
Is that a trope? (Please note that what I'm talking about is the kind of cross-over where it's not a team-up book; I mean where it's clearly one character's, or one team's, book.)