Hidemitsu Ishizawa

Age: 15 (debut), 25 (end)
Birthday: May 19, 1993

Ishizawa attends the same Junior High as Takagi and Mashiro. Ishizawa draws ecchi headshots of girls and brags about it. He later insults Mashiro's drawings. He is a large nuisance to the duo.

(Source: Bakuman Wikia)