Coy Aquilos is the princess of the Fox Kingdom. She is the only daughter and youngest child of the deceased Fox King and is considered the successor to the throne once Oliver Kuso is no longer in power. Although she is biologically more related to the Fox King than Oliver, she is last to the line to the throne because the Royal Fox Family prioritizes male children over female children, even if they aren't blood-related. Even so, she isn't too bitter about it as she has long accepted the fact that she will always be last in terms of the bloodline, even before Oliver was part of the family. However, her low status has people suspecting that she's hiding a dark secret and that she might have been behind the disappearance of her siblings.