Ai Haibara
Haibara Ai, real name Miyano Shiho, is the inventor of the APTX 4869 poison that shrunk Kudou Shinichi into Edogawa Conan, and a victim of the poison herself. Formerly Sherry of the Black Organization, she is on the run from them and lives with Professor Agasa. She is also one of few characters who knows Shinichi is Conan.
Miyano Shiho and her older sister, Miyano Akemi, were born into the secret crime syndicate "The Black Organization." Her English mother, Miyano Elena, and her Japanese father, Miyano Atsushi, were both scientists working for the Black Organization on an important secret project. While Haibara was young, both her parents died in what was claimed to be an accident. While Akemi lived a normal life, the highly intelligent Haibara was groomed to take over her parents' research. A child prodigy, she was sent to the United States for education at a very young age, and then later came back to Japan to finish her parents' secret project.