
Quick answer — Mari Kitayama worked on GTO: Great Teacher Onizuka (Sub Character Design), Ghost Stories (Sub Character Design), Yu Yu Hakusho OVA: "Two Shots" and "All or Nothing" (Character Design) and 4 more anime.
Mari Kitayama worked on GTO: Great Teacher Onizuka (Sub Character Design), Ghost Stories (Sub Character Design), Yu Yu Hakusho OVA: "Two Shots" and "All or Nothing" (Character Design), Flame of Recca (Character Design), Tokyo Mew Mew (Character Design), HUNTER×HUNTER Pilot-ban (Character Design), Yu Yu Hakusho: The Movie (Character Design).