Human Twilight/Fluttershy: (It’s implied that Sci-Twi has at least some of Princess Twilight’s characteristics such as her curiosity, but I’m comparing her to one of the Humane Six as well.) Common characteristics: polite, submissive, not athletic, archers
Sour Sweet/Applejack: Leaders/second in command, athletic, honest, has a bit of a temper, archers
Sugarcoat/Sunset Shimmer (before redemption): Intentionally hurtful, a bully, motorcyclists. (If you watch the first trailer carefully, you can see that Sunset clearly doesn’t like Sugarcoat’s jabs at Twilight; maybe this reminds her of her former self?)
Indigo Zap/Rainbow Dash: competitive, very athletic, wild, motorcyclists
Lemon Zest/Pinkie Pie: comic relief, in their own world, ditsy, roller-skaters
Sunny Flare/Rarity: detail-oriented, perfectionist, roller-skaters