Sometimes people you meet are really good at being antagonists, even if they don’t know it. Sometimes people you meet are wise mentors. You find a cliché, and you can probably find someone you’ve known who will fit the basic requirements. After all, those clichés and stereotypes have to come from somewhere, right?
It’s a little more complicated, a little more interesting than that. Of course it is. Real people are all sorts of tangled contradictions — and characters in books should be complicated too, unless you’re writing a ten-page picture book. So you can take certain aspects from people you know and put them in your characters. And even if you’re not writing new characters, you can still recognize aspects of old friends in new ones, the same mannerism between two people who probably have never and will never meet, or find that two people in two completely different situations irritate you in almost exactly the same way. Or, even if they have absolutely nothing else in common, sometimes a new person you meet will look almost exactly like someone you already know. (It’s weird. It’s uncanny. It’s cheating when you put it in fiction, I’m afraid, because coincidence tends not to exist in fiction, where the world actually makes sense.)
What sort of people do you meet again and again? Antagonists, friends, mentors, that weird person in the corner? What kind of stories would those types of people be suited for? Tell me in the comments!