Quick answer — Hiromu Arakawa worked on Silver Spoon Season 2 (Original Creator), Fullmetal Alchemist (Original Creator), Silver Spoon (Original Creator) and 10 more anime.
Hiromu Arakawa worked on Silver Spoon Season 2 (Original Creator), Fullmetal Alchemist (Original Creator), Silver Spoon (Original Creator), Daemons of the Shadow Realm (Original Creator), Fullmetal Alchemist: Brotherhood OVA Collection (Original Creator), The Heroic Legend of Arslan (Original Character Design), The Heroic Legend of Arslan: Dust Storm Dance (Original Creator), Fullmetal Alchemist: The Movie - Conqueror of Shamballa (Original Creator) and 5 more.