Fluttershy's brother was initially revealed by Andrea Libman at the 2015 San Diego Comic-Con International. In mid-March 2016, Jim Miller tweeted, "Spent the morning working on an #mlp6 episode with anew character I love to hate. Or is it hate to love?", and specified said character to be a "NEW character". On June 4, 2016—the day of Flutter Brutter's premiere—Miller tweeted, "15 minutes till you meet the character I love to hate! #MLPSeason6", and specified said character to be Zephyr Breeze.