The battle between Harley Quinn and Nightwing takes place in Batman Arkham Knight About the characters: Harley Quinn, an Arkham Asylum psychiatrist initially assigned to treat the Joker, Dr. Harleen Quinzel instead became fixated on her patient, believing herself to be in love with him. She helped him escape from confinement and took on her own criminal identity as Harley Quinn. Quinn is a violent and unpredictable felon whose only motivation, beyond general mayhem, is achieving the Joker’s approval. Becau
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