Black Lady is the corrupted and adult form of Chibiusa Tsukino in the anime series Bishoujo Senshi Sailor Moon. Manipulated by the villain Wiseman, she transforms into Black Lady and becomes an antagonist, turning against the Sailor Guardians. As Black Lady, she possesses powerful dark abilities and harbors deep resentment, especially towards her mother, Neo-Queen Serenity. Her transformation and eventual redemption are pivotal moments in the series, underscoring themes of love, forgiveness, and the power of familial bonds.