Harley Quinn, originally Dr. Harleen Quinzel, is a prominent character in DC Comics, known for her manic personality and complex relationship with the Joker. Initially introduced as a psychiatrist at Arkham Asylum, she becomes infatuated with the Joker and transitions into his accomplice and lover. Harley is characterized by her acrobatics, intelligence, and unpredictability, often serving both as a villain and an anti-hero. Her character explores themes of love, madness, and redemption, making her a unique figure within the DC universe, often depicted in both comics and animated series.