|School||Yamaboshi High School|
|Homeroom Teacher||Gotou Ryuuzen|
|Novel Debut||Volume 7, Chapter 3|
Ishikawa is shown to be cool and level-headed, rarely becoming upset, though if he does, he is quick to settle down. In Step Time, Ishikawa is shown to be a rather bland conversationalist, though he tries his best to keep his date with Mariko interesting.
Ishikawa is described as a physically impressive individual, well-built and very tall, at least compared to Mariko. He has short black hair and brown eyes.
- Nakayama Mariko: Ishikawa's girlfriend. They started dating during the "love boom" in the fall of their second year. Other people find it hard to believe that the cheerful Mariko is dating the more taciturn and cool Ishikawa.
- Watase Shingo: A friend of Ishikawa's and a fellow athlete. In Asu Random II, Ishikawa and Watase briefly get into an argument when their phenomenon causes Mariko to become attracted to the latter, but they manage to get a hold of themselves and talk it out.