Ok, so here's the basic idea. Her name is Bella, she's a changeling that went traitor around the time of the Canterlot invasion. Before anyone points out the obvious, I created her years ago, back when I first became a brony between seasons 3 and 4. She was originally gonna be a one off at the time, but kinda grew attached to her. She's kinda had to undergo a bit of a reworking since, what with the introduction of Thorax and the season 6 finale. The story I have her in, she's basicly been hiding out in Ponyville for years, laying low. She has a good heart, but is headstrong and tends to act rashly. But is also fearful of what would happen if she were found out. Her current story is not long after the changeling reform, Thorax is in town when he recognizes her favorite disguise. It's not far in, but if it does well, I may try a prequel with her early days in Ponyville.