Little Vampire(2004)

Original title: Petit Vampire

Michael is a little orphan who lives a carefree life with his grandparents. By day he goes to school. But at night he hangs out with Little Vampire, a friendly nocturnal creature, and his monster friends in his haunted house. Little Vampire would love to be a real living boy like his pal Michael. Both are enchanted by the others existence and enjoy discovering their alternative worlds.