Ishikawa is the information warfare/technology specialist in Public Security Section 9. It has not been stated in the series thus far as to the degree that he has been cybernetically augmented, though character dialogue suggests that he is one of the least augmented members of Section 9. His appearance is characterized by a large beard and perpetually unkempt hair, and he is the oldest of Section 9's field operatives. He formerly served with Kusanagi and Batou in South America when they were with the Ground Self-Defense Forces in the Japanese UN contingent. He was one of the earliest members recruited to be in Section 9 and seems to know the Major and her dislikes quite well. He is shown as being in charge of a gambling parlor called Parlor Ishikawa, and on occasion uses the cyberbrains of the old men who play there to complete particularly heavy data gathering, though it seems the men suffer no ill effects or are even aware of their situation. Ishikawa in terms of personality is the most seemingly laid-back member of the unit.

(Source: Wikipedia)