Princess Quest (1998)

Five princesses from surrounding kingdoms are visiting Granmalnie Castle, but young Prince Tapioca isn't showing much interest. Meanwhile, someone makes off with a valuable item. Queen Madeleine hires a young swordsman named Willow to investigate the theft. Willow is joined by Pal, a magical creature who transforms Willow into a girl, named Will. Using this disguise, Willow tries to gain the trust of the princesses, in hopes of determining who is responsible for the theft.