Izayoi (十六夜, Izayoi?) is one of the Eblan Four in Final Fantasy IV: The After Years, also known as Izayoi of Water. She is a kunoichi who views battle in a calm and collected manner. She is known to make use of her other assets, though she views herself as a ninja first, a woman second.
Izayoi wears a female-styled variant of traditional ninja garb, colored various shades of blue to reflect her elemental affinity for water. She wears a blue robe tied over her uniform with a large light blue bow, and blue boots. She has long brown hair tied in a ponytail and has blue eyes. While undercover in Troiaas an Epopt trainee, Izayoi disguises herself in a pink dress.
Izayoi's desire is to be taken seriously as a ninja, and not to be looked down upon or treated differently due to her gender. When Edge expresses displeasure at the Eblan Four desiring to be trained in the ninja arts used as tools of war, Izayoi protests that their ninja training allows them to do more for the world than fight, and that as ninjas it is their destiny to strive for the limits of human potential. In the Eblan Castle, one of the citizens mentions Izayoi has spurred all of his advances and suspects that someone else may have captured her eye, but Izayoi herself explains that she "doesn't want to be treated like a woman any longer." Yet, her mission is done in the most feminine environment: Troia, where she learns to become a killer seductress.