Luna was abducted at a young age by the group known as the Mysterious Six. During her captivity, she was forced to kill her father, Lucan. Luna has tried to repress the traumas she experienced during that time. However, one of the traumas still haunts her. Her cell walls were electrified, forcing her to keep her bed in the middle of the room, away from any walls.

Her psyche is guarded by a mental and emotional barricade. Luna is determined to take revenge on the mysterious Six, but she becomes more vulnerable after meeting the protagonist. Despite her initial instability, she develops a sense of self-worth.

Luna has an affinity for fighting and killing. She aspires to become one of the Four Serpents. Although she is not usually concerned with her appearance, she expresses a newfound interest in dressing up and appearing more feminine around the protagonist.