Twilight/Patchouli and Rainbow/Aya

Favorite
Twilight/Patchouli and Rainbow/Aya
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Bookworms and high flyers, why are these characters so similar?

Rarity/Alice and Pinkie/Suika

Favorite
Rarity/Alice and Pinkie/Suika
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Rarity, you should at least give Alice a blanket to cover herself. And Party hard Pinkie and Suika!