On November 22, 2013, Meghan McCarthy wrote on the Hub Network's Twitter account "Project Runway has Heidi Klum but she's not nearly as harsh a critic as #MLPFIM Fashion Week judge Prim Hemline". Like Ms. Harshwhinny, Prim has a unique facial structure compared to most mares: her muzzle is more angular, and she appears to have a slight overbite. She shares her body design with Stormy Flare, "Greenhoof Hooffield", "Betsey Trotson", S07E02 Unnamed Earth Mare #1, and S07E10 Unnamed Earth Mare #3.