Rainbow Dash's personality is based off of self-centered habits. She brags a lot, and likes to show off a lot. Her friends have tolerated it for a while, but are getting pretty sick of it, so they hire Lightning Dust to end her life.

EDIT: This story has been cancelled. I am terribly sorry about this. I have been backed up with the responsibility of school and my other stories. At the current moment, I am working on A Life-Changing Blessing, and I have strong ideas for two more Twilight's Experiments stories that I want to get started on soon. To be honest, this story was not one of my best ideas. :/