Problem: No matter what your setting or the situation you have that one character that's basically an extension of you in the play. They talk like you and walk like you and they're always the hero.
Solution: Change something about the character. Switch genders or nationalities...anything that makes the character "not you".
#2 Your Significant Other
Problem: You keep milking every fight you've ever had with your girlfriend/boyfriend or every cute thing that they've said that the love interest of your protagonist is basically a portrait of them.
Solution: Steal from somewhere else. Watch a romantic comedy or a sitcom. Heck, even read a good romance novel. Find another source to inspire your plays romantic fling.
|Borrowed from Reddit|
#3 Your Ex/Arch Nemesis
Problem: The same problem as above but villianizing someone who's done you wrong. All your antagonists are reminiscent of your high school bullies or the girl that turned you down for the prom.
Solution: Change something about them. Or you can mash two of them up to make someone completely unique. What would the perfect Frankenstein amalgam of all the people that drive you up the wall?
#4 You're High School Crush
Problem: Everyone had that guy or gal that they always loved...but from afar. You idolize everything about them. Now every time that you need someone with some sex appeal your crush is taking the stage again. And all of that idolization starts to come into play.
Solution: Try to find something human about them. No one's a saint. Find some flaws or quirks you can give them to help them out.
#5 Your Mother/Grandmother
Problem: Maybe it's because they have such an impact on our lives but for some reason or another the women that brought us into the world get brought into the world of our plays. Again with like your gf every nice thing that they said or every argument that you've ever had get's aired out onstage.
Solution: Make a concentrated version of them. Take their best and worst traits and exaggerate them. Be sure not to villianize them or idolize them. Just make your favorite or least favorite things about them a jumping off point to a great character.