Pistachio

Pistachio Maplewood is a kind, but cowardly boy who is suffering gradewise and can't seem to keep up. He is also one of the weakest students magicwise.

Possible Magical Starsign Link?
Near the very beginning of Magical Starsign, there is a room in the Will-o'-Wisp Academy that has students in it that declare that they're in detention. They mention a Proffessor Pistachio. Whether or not this is in fact Pistachio Maplewood is not made clear, but one might infer that this is an allusion to the Magical Vacation character.