Princess Cadence

She is Twilight's former foal sitter and current sister-in-law. She is married to Shining Armor and has been referred to as the "Crystal Princess". Her cutie mark is a crystal heart.

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Princess Cadence is the daughter of Princess Luna.

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The color gradient in Princess Cadence's wings is from an illness.

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Queen Chrysalis wanted to immitate Princess Cadence because Princess Cadence was going to rule over the Crystal Empire, which is powered by love, and would therefore be a large resource of food for her and her subjects.

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Rarity is secretly Princess Cadence.

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Twilight Sparkle is now the Princess of Friendship, as Princess Cadence is the Princess of Love

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