Ai Haibara, formerly known as Shiho Miyano, is a major character in the anime series 'Detective Conan'. She is a former member of the Black Organization, a secretive criminal syndicate, where she was known by her codename Sherry. After discovering the organization’s dark secrets, she attempts to escape and ends up taking the same experimental APTX 4869 drug that shrank Shinichi Kudo into Conan Edogawa, resulting in her transformation into a child. As Ai Haibara, she becomes a valuable ally to Conan, using her intelligence and scientific expertise to help solve cases and uncover the organization’s plans.