Fiona is a maiden who got trapped on the other side and works closely beside Mildred with the two sharing an apparently close bond. Unfortunately, we find that Fiona has tirelessly guards Mildred without supporting her own well-being. Additionally, Mildred may only have pretended to give affection to Fiona in order to simply take advantage of her vulnerability in loneliness. In Arcana Heart 2, her very young sister Angelica attains Mildred's power in the form of the Angel Arcana. This is likely her fate for eternity after her failure in the first Arcana Heart.