Emilia is a young half-demon who appears in the prologue OVA for the first Generation of Chaos RPG. Prior to the events that shape her destiny, she lives a peaceful life in a local town, working as a seamstress alongside her younger human sister. This tranquil existence is shattered when humans, driven by fear of demons, set their home ablaze, an attack that results in her sister's death. Following this profound personal tragedy, the demon Ashley Loff approaches Emilia, attributing the horrific attack to all of humanity and urging her to fight back. Ashley frames this call to arms as a necessary measure for survival against prejudice and as a means to prevent further suffering, which becomes the catalyst for Emilia's involvement in the game's broader conflict.

Emilia's personality is not explored in great depth, but her circumstances suggest a character who experiences a dramatic shift from a life of quiet innocence to one driven by grief and a call to vengeance. Her core motivation stems from the death of her sister and the manipulation by Ashley Loff, who channels her personal loss into a desire to resist human oppression. Her role in the story is primarily functional, serving as an introduction to the themes of conflict between humans and demons and setting the stage for the larger narrative. The OVA's structure heavily prioritizes the story of another character, Chiffon, meaning Emilia's segment comprises only a portion of the runtime, limiting the exploration of her character arc. Her background, motivations, and subsequent development receive less focus compared to other protagonists. Because of this, her relationships outside of her sister and Ashley Loff are not established, and her fate beyond the introductory premise remains unexplored, as no additional official media expands upon her character. The narrative does not detail any notable magical or combative abilities she might possess, focusing instead on her emotional state and role as a victim of circumstance and manipulation.