Kaitou Kid

Full name: Kaito Kuroba. Nickname? Kaitou Kid, Kid the Thief, Mysterious Thief Kid, Mysterious Thief #1412, Rupan Heisei, Shadow Sorcerer, KID_, 1412 (man, this guy has so many nicks... *-__-) He is a great magician, superb in undercovering and an "artist in stealing things" (the way he says "thief"). He is perfect in doing people's mimic, their voice, size, behaviour etc etc...
In this story, he appears as a bad guy (but he is good enough for a thief anyway) and tries to steal Black Star from Suzuki's party. However, Conan obviously gets it back from him and gave it to Sonoko's mum. He successfully fools Conan on their first meeting. Second appearance in Vol 20, Conan knows him from his anagram name "Katsuki Doito". If I may say so, he's the only bad guy Conan can't catch.
One more thing, he hates fish!