Dark Magic librarian

This librarian worked at the Royal Library of Canterlot and guarded the Dark Magic wing from unauthorized patrons. Despite a macabre-sounding title, she didn't appear to be in any way wicked. She was a lax worker, but took her job seriously to alert Princess Celestia when Sunset Shimmer broke into her wing. Her cutie mark was a green, opened book.

Appearances

 * "The Fall of Sunset Shimmer"