Conan Edogawa

Age: 6-7 (as Conan); 17 (as Shinichi)
Gender: Male   

Height: 174 cm (as Shinichi)
Relatives: Yusaku Kudo (father) & Yukiko Kudo (mother)

At the beginning of the series, Shinichi is a 17-year old student at Teitan High School. He is already well-known as a brilliant young detective, the "Savior of the police force", for solving many difficult cases that the professionals could not. However, while investing 2 mysterious men, he is spotted and forced to swallow an experimental poison known as APTX 4869. This results in his body shrinking to that of a 6 year old.

Shinichi comes up with the alias Conan Edogawa after Arthur Conan Doyle and Edogawa Rampo and pretends to be a distant relative of Agasa's who places Conan in Ran's care. Ran's father Kogoro Mouri, owns a Detective Agency which Conan uses to his advantage to discover cases involving the Black Organization.

As Conan, Shinichi helps Ran's father solve cases by putting him to sleep and simulating Kogoro's voice using the special bowtie gadget Professor Agasa made for him. By solving cases one after the other, he helps build up Kogoro's reputation who will later on be referred to as "Sleeping Kogoro". He also spends a good amount of time with his Detective Boys fellows and solves many small cases with them and sometimes in the company of Professor Agasa.

(Source: DetectiveConanWorld)