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((Still got Kirby on the brain a little bit because of the Nintendo Direct, so I wanted to say that if Ghost was in the Kirby universe, they and Meta Knight would be fighting constantly.
It's not that they don't get along-- I can't think of any reason they'd particularly dislike one another, at least after everyone learns that Ghost isn't this week's latest Evil Entity who's come to take over Popstar.
Rather, Meta Knight loves to battle, especially against powerful opponents. He also has a preference for sword duels specifically. Ghost is a very strong fighter who wields a sword-like weapon and is pretty much always up for a friendly sparring match.
So yeah. If neither of them have anything better to do (or even sometimes if they do), there's a pretty good chance that you'll find them off sparring with each other somewhere.))