Princess Cadance

Princess Mi Amore Cadenza, or Princess Cadance is an Alicorn pony from My Little Pony: Friendship is Magic, who is first featured in the season two finale alongside her husband Shining Armor. She is Flurry Heart's mother, Twilight Sparkle's sister-in-law (after marrying Shining Armor) and former foal-sitter, Princess Celestia's adopted niece, and the co-ruler of the Crystal Empire alongside Shining Armor. She is also stated to be "a very distant relative" of Princess Amore, the former unicorn ruler of the Crystal Empire.

Season two
Twilight Sparkle first mentions Cadance in A Canterlot Wedding - Part 1 as she reads Princess Celestia's invitation to the royal wedding of "Princess Mi Amore Cadenza" and Shining Armor. Twilight doesn't recognize who the princess is. When Twilight meets Shining Armor in Canterlot, he explains that Princess Mi Amore Cadenza is actually Cadance, Twilight's old foal-sitter. Twilight excitedly calls Cadance "the greatest foal-sitter in all the history of foal-sitters" and says that Cadance is beautiful, caring, and kind.

Twilight has a flashback to when she was a foal and Cadance was her foal-sitter. Cadance greets young Twilight with a hug, bandages her and wipes her tears when she's hurt, plays with her on a swing-set, tells Twilight she feels lucky to be her foal-sitter, and does a little song and dance with her. Twilight's voice-over says Cadance spreads love wherever she goes, while a brief scene shows Cadance casting a spell that quells an argument between Lucky Clover and Wild Fire. Twilight mentions in the flashback that Cadance is a princess, while Twilight calls herself "just a regular old unicorn."

Immediately after the flashback, Cadance joins Twilight and Shining Armor. Twilight enthusiastically greets her with the song-and-dance from the flashback, but Cadance coldly rebuffs her. Throughout the episode, Cadance raises Twilight's suspicions with her "demanding," "totally insincere," and "rude" behavior, as Twilight tells her friends. Twilight tries to broach the subject to Shining Armor, but Cadance interrupts before they have a chance to talk and takes Shining Armor into another room. Twilight, peeking through the door, sees Cadance casting a spell on Shining Armor. Concluding that Cadance is "downright evil," she runs off.

Twilight later confronts Cadance at the wedding rehearsal, in front of Princess Celestia and the rest of the attendants. After Cadance runs away from the rehearsal in distress, Shining Armor angrily explains that the spell Cadance used on him was meant to ease his chronic headaches. He excuses Cadance's behavior as stress from the wedding preparations. After everyone leaves, Cadance returns and at first looks down compassionately at a rebuked Twilight. Then her eyes shine green, her face becomes cruel, and she encircles Twilight in green flames, which pull her into the ground as the episode ends.

The story resumes with A Canterlot Wedding - Part 2. Underground, in "the caves beneath Canterlot," the imposter Cadance taunts Twilight through apparitions in the caves' crystals. She tells Twilight that the caves are the ideal place to keep those who try to interfere with her plans. Twilight attacks the apparitions with blasts of magical energy from her horn, and eventually breaks open a passage to find a scuffed and scared Cadance who almost immediately recognizes Twilight and tells her she's been imprisoned by the imposter Cadance. She does the song-and-dance from Twilight's flashback, proving her identity, and the two ponies warmly hug. Cadance and her imposter share a song sequence, This Day Aria, Part 1, with Cadance and Twilight making their way out of the caves while the imposter prepares for the wedding and begins the wedding ceremony. After the song, Twilight and Cadance are confronted by the three former bridesmaids Lyra Heartstrings, Minuette and Twinkleshine, who block their way out of the caves. The scene cuts to the imposter and Shining Armor almost completing their wedding ceremony, when Twilight and Cadance interrupt the wedding, and a brief flashback shows Cadance throwing a small bouquet to distract the bridesmaids. Cadance declares that the imposter is a changeling, and the imposter reveals herself as queen of the changelings. Cadance charges the queen, but backs off when the queen threatens to send her back to the caves. After a failed attempt to get the Elements of Harmony, Twilight and her friends are brought back to the wedding hall by the queen's minions, where Celestia is imprisoned in a cocoon and Cadance's hooves are glued to the floor.

Twilight takes the opportunity, when the queen is preoccupied, to free Cadance so she can reunite with Shining Armor, and her magic snaps him out of his trance. Cadance tells Shining Armor that her love will give him strength, and their magic spreads outward and repels all the changelings off into the horizon.

Twilight and her friends help Cadance put together her wedding, with arrangements meeting her enthusiastic approval, and Shining Armor jokes that Cadance agreed to marry him after he told her she'd be gaining Twilight as her sister. At the wedding, Celestia proclaims that the power of Cadance and Shining Armor's love is undeniable, and pronounces them "mare and colt." The couple look onto the castle courtyard and wave to the cheering crowds, then kiss.

After a wedding reception montage, Cadance and Shining Armor enter their chariot and Cadance tosses a bouquet, which Rarity violently claims. The happy couple then ride off into the night.

Role in the Series
Cadance continues to play her role in the series as a well-respected hero. In the series, it is revealed that Cadance is not an adopted niece of Celestia as she is her actual niece, as her father is Celestia's hardly-spoken-of brother Prince Picture-Perfect, a prince in a far kingdom of Equestria who is obsessed with making the perfect kingdom. He ended up having an affair with a Unicorn, and in turn gave birth to Cadance, who was born a pegasus until doing a princess-worthy deed as a result of her inherited knowledge in magic. Cadance was so guilty of her heritage to a questionable father, and preferred not to speak of him. She met Shining Armor in the events of Magic University, but since then they have hardly met until the events of the MLP comics. She even spends a few Chronicles episodes pregnant with Flurry Heart before labor.