Even though I typically like the designs given to the girls in the Equestria Girls stories, the one thing that does get on my nerves is how they're all basically the same shape and face copy-pasted over and over. There's no variation in height, weight, the shape of their faces or anything, aside from minor aesthetic differences, like having Rarity with make-up or the like. If you were given the chance, what kind of differences would you give them?
Keep in mind these were all individual warm-up sketches I did throughout the day. So they’re neither the best sketches or the best designs. But they generally capture what I’d go for. The main intent is to make them all unique from each other, and suggesting their personalities.
Twilight would go full cute-nerd, taking on a bit of the anime-school girl look. Her body type is tall-ish and slender. This is Sci-Twi, btw. Pone Twi would probably wear something similar but a bit bolder.
RD changes very little. Her design is pretty good. For the sake of this, I took her skirt and just gave her gym shorts, but I personally think that RD has a good rotation of shorts, skirts, and skorts in her wardrobe that she wears as she she sees fit. Average body frame, if a bit on the short side–but she’s got a runner’s build with well toned muscles. Oh, and shorter hair.
I’d want to glam Rarity up a bit, while still casual keeping her outfit from being overwhelming. The focus would be on grace of line and form, with tasteful color contrast. She’s got a very even hourglass figure, and is fairly tall.
I’d make AJ a big gal. With an an impressive figure both in muscle and in curves. Definitely the tallest of them all. But I think she’d dress pretty practically in clothes she’d feel comfortable working in at any time. Jeans and button-top over an A-shirt.
Fluttershy would be tiny and adorable. The kind of girls that gets mistaken for 14 all through her 20s. She’d wear rather modest but pretty clothes. Long sleeved shirts and long dresses. (Note: this was the last of this patch that I drew and I think it’s the weakest. Probably needs a redraw all together).
Pinkie has a stocky but rounded figure. THICC you might even say. The trick would be to make her clothes playful without being absurd looking. Color contrast and complex bits like frills will help, as well as pockets and zippers.
Again, these are all one-off preliminary designs. Good character design goes through a hundred iterations before settling on something for sure.