Starlight Glimmer. She is like an outcast Twilight Sparkle, and that provides an unique take on the whole friendship thing. Starlight is like a Batman villain with her obsession caused by childhood trauma. And you see her sometime falling back onto that controlling aspect of her personality by putting spells on ponies. Like de-aging Sunburst was a really messed thing to do. She is learning to be a better pony and I am excited to see what happen to her and how she react to stuff.