
Quick answer — Kouji Ogata worked on Boogiepop Phantom (Original Character Design), Boogiepop and Others (Original Character Design), Demon Lord, Retry! (Original Character Design) and 2 more anime.
Kouji Ogata worked on Boogiepop Phantom (Original Character Design), Boogiepop and Others (Original Character Design), Demon Lord, Retry! (Original Character Design), Demon Lord, Retry! R (Original Character Design), Origin: Spirits of the Past (Character Design).