Teteru Lemercier is the reigning Duke of Rain Dukedom, however unlike Nike's grandmother Tohara, he is just a figure head. Teteru is Nike's father and Livius' father-in-law.


Although he is the Duke of Rain Dukedom, he does not have any power like grandmother. Nike's grandmother scolded him when he gave Nike away as a wife to Livius.


Unlike his mother-in-law (Nike's grandmother), Teteru is laid back and kinder towards outsiders, such as Livius.