Flan Princess is an enemy in Final Fantasy Dimensions.
It's a very tricky foe to defeat. Princess's Melody will inflict Berserk to all allies and this enemy has very high DEF. Chouchou and Dueling Mask are very helpful and they can be won from Coliseum or bought from Moogle Cave.
Flan is an open pastry or sponge cake containing a sweet or savory filling. A typical flan of this sort is round, with shortcrust pastry, usually coated with sweet syrup. It is similar to a custard tart or a South African melktert.