Ai Haibara (灰原 哀 Haibara Ai?), real name Shiho Miyano (宮野 志保 Miyano Shiho?), is the creator of APTX 4869, the pill that shrunk Shinichi Kudo into Conan Edogawa, and a victim of it herself. Formerly Sherry (シェリー Sherī?) of the Black Organization, she is on the run from them and lives with Professor Agasa. She is also one of the few characters who know that Shinichi is Conan.

Bai Zhi, born in a traditional Chinese medicine family, has been learning Chinese medicine from her elders since she was a child. After years of hard work and practice, Bai Zhi has become an experienced traditional Chinese medicine doctor, responsible for the family's medicinal material management and health consultation.