Little to nothing is known about Miltia's history. It can be assumed that she grew up with her sister Melanie Malachite. At some point, they joined Junior Xiong's club and acted as his personal bodyguards.
Miltia and Melanie are first seen at the bar next to Junior, but he sends them away when Yang Xiao Long takes a seat next to him. After Yang assaults Junior and defeats his henchmen, Miltia and Melanie confront Yang themselves and hold their own against Yang's brutal fighting style, even knocking her down.
However, Melanie is knocked back soon after and Miltia is forced to fight Yang on her own. She is unable to compete with Yang's speed without her sister and is soon sent flying through a large glass column.
Miltia is seen briefly in "Painting the Town..." She is seen sitting by the entrance of the Club, next to her sister, seemingly observing Yang talking to Junior. When Neptune Vasilias tries to talk with them both, they tilt their heads dismissively and walk away.