
Quick answer — Ryouta Yamaguchi worked on ONE PIECE (Script), Sailor Moon Sailor Stars (Script), Sailor Moon SuperS (Script) and 8 more anime.
Ryouta Yamaguchi worked on ONE PIECE (Script), Sailor Moon Sailor Stars (Script), Sailor Moon SuperS (Script), Blue Exorcist (Series Composition), DIGIMON BEATBREAK (Series Composition), Glitter Force Doki Doki (Series Composition), Medabots (Series Composition), Digimon Data Squad (Series Composition) and 3 more.