Limestone Pie and Marble Pie

Limestone Pie is a female Earth pony and Pinkie Pie's younger sister. She is first seen as a filly in a flashback in The Cutie Mark Chronicles and is first seen full grown in Hearthbreakers.

Depiction in the series
Limestone is first seen as a filly in The Cutie Mark Chronicles. Like her sister, Marble Pie, she doesn't have any lines in this appearance. She is then seen in a picture with the rest of the Pie family in Pinkie Pride.

Limestone is first seen as a grown mare in Hearthbreakers. Here, she is depicted as being very aggressive, acting as if she owns the farm. She is especially protective of Holder's Boulder, a large sacred boulder on the farm.

Quotes
"Gaze into the eyes of Limestone Pie. Ma and Pa may own this rock farm, but I keep it running."

- Hearthbreakers

"Stay off Holder's Boulder!"

- Hearthbreakers

"What. Happened. To. My. Farm!"

- Hearthbreakers

"Well, don't just stand there! We got a boulder to move! And I'm in charge."

- Hearthbreakers