His name is Rusta, and he is an elderly
Rusta is a character who appears in Skyward Sword. He spends most of his time in the Lumpy Pumpkin and the Bazaar kitchen, often telling tales about a demon he claims to have seen living in Skyloft. He tells Link that the demon gets in by pushing a certain grave in the Graveyard at night, which opens the entrance to the shed. If Link follows these directions, he will find Batreaux's House. Batreaux is actually the demon of which Rusta speaks.