If you've ever been part of an office, faculty, or team, you've participated in energizers. These are quick activities that motivate or bond members of group. Funny thing is, many of them can be used to help you build your characters.
Consider: Two Truths and a Lie.
In this activity, members write down three facts about themselves. One is a lie. During the course of a meeting, day, or term, members get to know each other. After time, they might be able to pick out each other's lies. It's also a way to bond. You learn about things you have in common, or you learn things you simply didn't know about each other.
In your story, you can play this with your characters. Every character has a lie he believes about himself.
I'm incapable of love.
I am not a good friend.
I am perfect.
I cause trouble wherever I go.
As you develop your characters, think about what are the truths and what are the lies. Give life to each. See where they take the story and character. Who believes the lies? Who can't believe the truths? This will help develop other characters.
Know your characters before the story begins. What kind of lies would this type of person need to believe in order for the plot to develop the way you want it to? This helps build a real arc that develops naturally alongside the plot.
Study other novels. What lies did your favorite characters believe until they learned their lesson? FIGHT CLUB is probably one of the best stories where a character carries his lie deep into the story.
Share your thoughts. What are you working on now, and what lie does your character believe?