Spike the Dragon is a purple baby dragon with green spines, based on the "G1" and "G3" character of the same name. Hatched from an egg by a young Twilight Sparkle as part of her entrance exam for Celestia's academy, he fulfills the role of Twilight's "number one assistant", named so for his loyalty and skill at helping Twilight solve problems and learn lessons. He is also described as having "an incurable crush on Rarity, an insatiable appetite for sparkly gems, and the uniquely comical ability to messenger letters via his fiery dragon breath." Spike's parents are deceased. Author Begin calls Spike a foil to the Mane Six in terms of personality, size, and shape, which "provides plenty of opportunity for exploring this difference in story lines." He adopts a newborn phoenix named Peewee as a pet.

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