Kikuchi is a very smart guy, although not as smart as Kanzaki. He frequently gets the highest test scores in school.
He’s also very tech-savvy, owning a computer and knowing how to photoshop (very impressive back then). Hacking is also something he’s kind-of good at.
While his class terrorism motivation is the same as most of his classmates, he’s ultimately more of a maverick than others. He gives up the class terrorism upon realising Onizuka isn’t like most teachers.