Ai Haibara

Real name: Shiho Miyano. Codename: Sherry. The inventor of APTX 4869. Confused? She was a member of Underground Crime Ring (an organisation where those "MIB" work there). Her sister, Akemi Miyano's death turns her away. She is about to be killed when she remembers about the effects APTX 4869. Then she felt that it'd be better if she commited suicide, so she drinks it and gets away from her handcuffs. She doesn't feel embarassed about being a kid again because she knows that Shinichi Kudou experiences the same thing. Ai is an introvert in every way she is, she's mysterious.