As told by a Side Character

I swear I'm going crazy :P Great story ideas and the like! wooot!!

"You can be the main character of your own life, or you can be the side character of life. Your choice. What will you choose?"

The story will be about a girl... that isn't particularly special. She doesn't have anything that important in her life, nor do many things interesting happen to her. However, she knows people. She knows a lot of people. And despite the fact that she has no qualities that would lead her to be a main character, she has the capability to be the side character to a lot of lives around her, and to strangers not near her.

The book would be a compilation of short stories, all in first person narrative, I guess. Each one will be about the narrator and an important event in their lives, but the climax or the important event would not occur without this girl. She never really gets to narrate (except perhaps the prologue and epilogue?), she only has the chance to be a part of many people's stories. And she has the capability to shape all of these, be it for better or for worse.