Let's talk about race swopping. Are there any Ponies you think would work better (or at least be interesting) if they were a different race?

I found the concept of Earth Pony Twilight from those leaks very intriguing. I guess I wouldn't want to to actually retcon Twilight specifically, but I love the concept of a character who is extremely magically gifted, but they're an Earth Pony. I wish Starswirl was revealed to be an Earth Pony with a big magic staff, it'd be cool to have the most legendary magic-user in Equestria to be an Earth Pony.