Editing Unwritten: System Reference Document/Starting a Game (section)

===Establish the Protagonists===
Here is where the GM and players begin to discuss what they want each individual character to be, how the characters know each other, and why they are together. This discussion informs character creation, especially the choice of High Concept.

The characters will be interacting, so it is important for the players to figure out why they are interacting and why they might continue to do so in the future. A lone wolf character might have a neat concept, but if a character ends up spending all of their time away from everyone else, then they are essentially playing their own game on the group’s time. This doesn’t mean that characters can’t split up and don’t get unique moments to shine, but the game is a group activity and the dynamics of the characters should support that.

Also discuss how characters might conflict with each other. Some groups have fun when the characters are at odds; some do not. That should be worked out up front.

Filling out the details of your characters is a part of character creation, covered in the next chapter.