Do you base your characters off of people in your life?
I don't try to base all of a character on one person, maybe bits and pieces but in the novel I'm writing called Doormat Syndrome, every character is based on someone in my life.
The one I'm focusing on is my main antagonist. She is shallow, selfish, rude, and vain. Honestly, I don't know why or how I put up with her for so long but I did. She's still in my life now but only when she needs something - that's the only time she'll contact me. This person and I still talk to. She's not always bad but she does have moments that just completely cancel out her goodness.
Maybe I'm being a pessimist.
But you'll understand why I call her my Shallow Antagonist if you read the pieces I've already written about her. I will probably post a few at some point in time.