<Li> Cathy Weseluck as Spike, a baby dragon who is Twilight Sparkle's faithful assistant . </Li> <Li> Emily Blunt as Tempest Shadow, an embittered unicorn once known as Fizzlepop Berrytwist who serves as the Storm King's second - in - command in order to repair her broken horn . On the development of the character, screenwriter Meghan McCarthy said, "We just arrived at this idea of a character who had come from Equestria, and had not had the positive experience that Twilight (Sparkle) and her friends had . It felt like a good counterpart to our heroes was to have a villain who didn't just not get friendship, but had a reason that she didn't understand it ." McCarthy also called Blunt's performance "a big influence" on how the character was animated in the film . </Li> <Li> Michael Peña as Grubber, a wisecracking hedgehog creature and Tempest Shadow's cohort . McCarthy said that Grubber "needed to be goofy" to counterpoint the "very straight - laced, hardcore" Tempest . Peña ad - libbed much of the character's dialogue, with McCarthy saying, "You get Michael Peña in a recording booth, and you just are like,' Please just go and say funny things .' He will be there for hours, just giving you all kinds of really great material that was not something that we had originally scripted!" </Li> <Li> Liev Schreiber as the Storm King, the despotic, satyr - like leader of the storm creatures who conquers lands in search of powerful magic to control the weather . On his acceptance of the role, Schreiber said that he wanted something child - friendly for his kids to watch, noting his repertoire of violent, adult - oriented films . Comparing his character to Basil Rathbone, Schreiber said the Storm King "is prone to temper tantrums, and he's a little crazy . He has a wide range of behaviors ." He considers the character to be "one of the more intense roles (he's) played". </Li>

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