Yuujirou Hattori

Age: 27 (debut), 36 (end)
Birthdate: April 3, 1982

Yuujirou is one of the youngest editors at Shounen Jump and editor of Eiji Nizuma's succesful manga Crow as well as Fukuda's, Kiyoshi Knight and later Road Racer Giri.

Yuujirou has difficulty keeping Eiji in line, but prides himself on finding such a talented Mangaka. Due to his success, he later becomes a team leader.

While initially arrogant towards Hattori Akira, Yuujirou eventually warms up to him to the point where they meet regularly and exchange ideas as editors.

(Source: Bakuman Wikia)