Filia was once just an average schoolgirl, with her best friend being Carol before she was kidnapped. Filia was the daughter of Amelia and Marcus Medici. Filia met Samson along with his previous host, a dog he had named Dog one year before the Skullgirl returned thanks to Carol. When Carol brought Samson to see if Filia could take care of him, Filia reluctantly agreed to keep him after he pledged to protect her and assured her that although a parasite, he wouldn't leave her for his own well bein