My Little Pony: The Legend of the Humacorn Volume One

A mild autistic human MLP fan named Charlie Carvette Equestrian is the future grandson of Carvette, the legendary Humacorn who banished the Storm King to the south of Equestria. The retired princesses Celestia and Luna came to his world to help Charlie become the next Humacorn and restore Ancient Equestria from the Storm Queen with the Mane 5. Based on Charlie's life and dreams.