Luca Trulyworth is a prominent character in the Ar Tonelico series, specifically in Ar Tonelico II: Melody of Metafalica. She is a spirited and determined young woman with a strong sense of justice and empathy. Luca is a Dive Therapist, a person who helps others by diving into their subconscious using a special ability. Her personal journey is central to the storyline, as she grapples with her past and her connection to the world of Metafalss. Luca's relationships with other characters, especially the protagonist, are pivotal in unraveling the mysteries of the plot.