Black Hanekawa is an alternate personality of Tsubasa Hanekawa in the Monogatari Series. Manifesting during times of extreme stress, Black Hanekawa is a catlike apparition known for her sharp wit, mischievous behavior, and brutal honesty. She is distinct from Tsubasa, exhibiting a carefree and bold demeanor. Black Hanekawa plays a crucial role in helping the protagonist, Koyomi Araragi, unravel supernatural mysteries and understand the complexities of Tsubasa's suppressed emotions.