Whenever I've drawn Twilight Sparkle, I always wanted her to look like a student or a princess. In the case of Sunny, she goes to many different places, especially in A New Generation, so it makes sense to give her some sport outfit. At first I wanted to give her only leggings, but I think it would be too bland, so, based on other photos I've seen, some shorts with leggings is a nice touch. And, since she's the type of a runner, I gave dirt to her sneakers. I'm not very good at designing boots and sneakers, so I hope you like it all things considered.
As much as I liked Make your Mark, I'm not into Sunny's rainbow hair, so I took it out and gave her a wristband with these colors. Depending on what the fanart would require, it would have either three colors or the rainbow colors.
But yeah, I'm excited to see more of Sunny! She's great as a main character! She's likeable, determined, relatable, friendly, passionate, optimist… I think her personality will be great for her to face the upcoming conflicts and struggles of G5.