Mylene is an inhabitant of Estelle's hometown of Rolent.
A loving homemaker, Mylene mentions having a son who's teaching at Jenis Royal Academy. Since he doesn't come home very often, she has focused her motherly affections on their housekeeper Lita instead and treats her as part of the family, often taking part of the work off her hands.
She and Lita received quite a scare when their home was suddenly invaded by mysterious thieves. Fortunately, the intruders weren't violent and she and Lita were merely locked up in the attic. Since the robbers were wearing masks, she couldn't tell the bracers what they looked like, but she did point out that it was strange that they managed to get in so easily despite her having the door locked.
She's also the employer and somewhat of a mother figure to Lita