Limestone Pie

Limestone Pie is a female Earth pony who is a member of the Pie family. She is first seen in a flashback as a filly in The Cutie Mark Chronicles before making her debut as a grown mare in Hearthbreakers.

Depiction in the series
Limestone first appears as a filly in Pinkie Pie's flashback in The Cutie Mark Chronicles. Unlike her parents, see doesn't have any dialogue. When Pinkie Pie throws her first party in order to spread cheer, Limestone is shocked at first, but she slowly smiles and join in the festivities.

She appears in a picture with the rest of the Pie family in Pinkie Pride.

Limestone appears as a grown mare in Hearthbreakers when the Apple family and Pie family spend Hearth's Warming Eve together. Here, she is depicted as very aggressive, acting as the primary caretaker of the rock farm. She is especially protective of Holder's Boulder, a large sacred boulder on the farm.

Limestone is mentioned collectively by Pinkie Pie on The Gift of the Maud Pie, explaining to Rarity how Pinkie meets with each of her sisters in various locations around Equestria for gift swap meets.

She briefly appears at the beginning of Rock Solid Friendship, watching Maud Pie's graduation.

Limestone appears in The Maud Couple, when Pinkie returns to the family rock farm after being unable to accept Maud's new boyfriend, Mudbriar. While Limestone is initially jealous to hear that Maud has a boyfriend, she (with a little prompting from Marble) convinces Pinkie that Maud sees something good in Mudbriar, and that he makes her happy, which is what really matters.

In the holiday special My Little Pony Best Gift Ever, Limestone appears celebrating Hearth's Warming Eve with her family. During One More Day, she pushes a large gift boulder across the Apple family's living room. She and Marble later discuss with Pinkie about what gift she should get for Twilight Sparkle. They are last seen during The True Gift of Gifting, making their traditional Hearth's Warming dolls out of rocks alongside Maud, Mudbriar, and Apple Bloom.

In The Last Problem, Limestone appears in Pinkie Pie's group shot during The Magic of Friendship Grows.

Trivia

 * She is the first pony in the history of the show to have two different eye colors (her eyes colors are amber in Season 1 as a filly and her eye colors are green as a grown mare). She is also the only member of the Pie Family to have two different eye colors.
 * She is the only sister of the Pie Family who has never been involved with romance, unlike Pinkie Pie, Maud Pie, and Marble Pie, who have been involved in romances with Cheese Sandwich, Mudbriar, and Big Mac.
 * She and Marble Pie have the same number of episode appearances in the show, with a total of six.
 * Like the rest of her family, she is a fan of rocks.