Harley Quinn

"I'm known to be quite vexing, I'm just forewarning you." - Harley Quinn

An Arkham Asylum psychiatrist assigned to treat the joker, Dr. Harleen Quinzel instead became obsessively fixated on her patient, believing herself to be in love with him. She helped him escape and took on her own criminal identity as Harley Quinn. She is violent and unpredictable who's only motivation is achieving the Joker's approval.