
Quick answer — Kazuki Takahashi worked on Yu-Gi-Oh! (Original Creator), Yu-Gi-Oh! 5D's (Original Creator), Yu-Gi-Oh!: The Dark Side of Dimensions (Original Creator) and 8 more anime.
Kazuki Takahashi worked on Yu-Gi-Oh! (Original Creator), Yu-Gi-Oh! 5D's (Original Creator), Yu-Gi-Oh!: The Dark Side of Dimensions (Original Creator), Yu☆Gi☆Oh! (Original Creator), Yu-Gi-Oh! GX (Original Creator), Yu-Gi-Oh! 3D: Bonds Beyond Time (Key Animation), Yu-Gi-Oh! ZEXAL II (Original Creator), Yu☆Gi☆Oh! (Movie) (Original Creator) and 3 more.