I saved this study for last because it was in some ways the easiest. She was the first of this set of characters so I have the most practice with her and have a pretty good handle on how she stands, glares, and holds a sword.
Because the universe has a sense of irony, she's also the hardest. I need her to be demonstrably the same character while having two different appearances: One as she actually is, and one a disguise she wears to not freak the squares.
So I tried to make her appearance as consistent as possible:
-Though I loath the 'all women wear 3-inch heels' aesthetic, (It's stupid. The character design should reflect the character. Heels aren't a default, they're a decision.) in this case it actually made sense. I decided that the glamour she's wearing to create a human appearance has limits: it can't make her look like someone else, it can only obscure details. And it's not very good and being sensorily consistent: her hooves click as she walks. Heels help explain the sound plus her her height (digitigrade legs give you leggier proportions) and the glamour does the rest.
-I designed her to have large areas of solid black. Keeping these blacks in the same places on both forms helps her look consistent. If she were done as an eight-bit character, she'd look much the same in both forms. Being able to identify a character even in a fuzzy or simplified form is one indication of good character design.
-Her hair, face, and jacket only have minor changes. Readers don't pay nearly as much attention to limbs as torsos: changing the shoes on a person doesn't make them harder to identify, but changing their hat definitely does.