Quick answer — Kouichi Usami worked on GTO: Great Teacher Onizuka (Character Design), Detective School Q (Sub Character Design), Maoyu: Archenemy & Hero (Prop Design) and 1 more anime.
Kouichi Usami worked on GTO: Great Teacher Onizuka (Character Design), Detective School Q (Sub Character Design), Maoyu: Archenemy & Hero (Prop Design), Failure Frame: I Became the Strongest and Annihilated Everything with Low-Level Spells (Creature Design).
