Gin

Gin is a member of the Black Organization and a main antagonist of the series. He is the organization member who gave Shinichi Kudo the experimental poison APTX 4869 which turned him into Conan Edogawa. He is frequently paired on missions with Vodka. In the English manga, he was first introduced as Melkior, but later was reverted to Gin. This is likely due to the fact that Conan is often reminded of the Black Organization by references to alcohol.

Of the high ranking members of the Black Organization shown, Gin is the most loyal: he follows the boss' orders most closely and virtually never acts against the Organization's greater interests. He is also one of the Black Organization's most dangerous operatives; Conan miscalculating his intelligence, abilities, and speed of response have resulted in several very close calls and awry plans.