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It sounds like you're just trying to write something that's real. I mean, who doesn't act silly? Whether it's around their friends, for someone's amusement, or generally just by being themselves? It could be down to something done by pure accident. Yet at the same time, if you don't take life seriously enough, you're gonna wind up with some serious problems. When trying to add something a bit silly into something that's serious. Just put yourself in such a situation, or observe how your friends, or other people, may act. Observing how other people go about their daily business and using that in your story or game is probably the best thing to do when it comes to creating more believable characters.
Go spend the day out somewhere, go to a cafe, bar, park, or the shops and just note down things that people around you do. You will find a good mix or quirky, funny, silly, and serious stuff.
I wouldn't go delving into other books, or games, or films or anything because then you're not really being imaginative. The best thing to do is to just observe and take notes... but don't go stalking people!
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