Mr. and Mrs. Cake

 

Mr. Carrot Cake and Mrs. Cup Cake are the owners of Sugarcube Corner, and Pinkie Pie's employers and landlords, as they rent the loft above the shop to her. Their full names have not yet been mentioned in the show, but they've been mentioned by the show's creator, Lauren Faust.

History
The couple frequently performs catering services to the town, specializing in sweets and baked goods. They are seen preparing many cakes and sweets in preparation for Celestia's visit in Swarm of the Century, and wait on her in the party thrown for her in A Bird in the Hoof. Despite this, Sweet Apple Acres was supplying food for the Summer Sun Celebration, meaning the Cakes are not the sole caterers in Ponyville.

Pinkie Pie works for them in their shop, and is thus given a lot of patience by the Cakes, especially when she eats the merchandise or uses their shop floor as a party location. Faust has stated that they love her as a daughter. Mrs. Cup Cake has a particularly motherly affection, referring to the Princess, albeit not deliberately, as "dearie".

Appearances

 * S1E4: Applebuck Season
 * S1E10: Swarm of the Century
 * S1E22: A Bird in the Hoof
 * S1E25: Party of One (Mrs. Cake only)

Trivia

 * In A Bird In A Hoof, at 5 minutes and 9 seconds in, Mrs. Cakes' gasp is a reused sound of Pinkie's gasp in reaction to Twilight Sparkle's appearance in Ponyville in Friendship is Magic, part 1.
 * Mr. Cake has a protruding lower jaw or underbite.