Jeanne is a character from the Millennium series.
Jeanne is a tiny fairy that is encountered at the beginning of Millennium - A New Hope, when Marine accidently falls on her.
Jeanne is a semi-playable character: she can only be summoned by Marine during a fight, but then is able to cast spells in order to help the party.
Jeanne add a strategic dimension to the game.
Jeanne and Marine quarrels at the end of Millennium 2 - Take Me Higher. As a matter of consequence, Jeanne is absent in most of Millennium 3 - Cry Wolf.