Mason

Mason is Sig Curtis' assistant at his meat shop. He is also acquainted with the Elric Brothers. During Ed and Al's training on the island, Mason dressed up as the man in the mask to keep them alive and help them train. Usually good humored, upbeat, and easy going, he appears to have a close relationship with the Elrics, as he immediately recognized and greeted them upon their return to Dublith. While his duties mainly revolve around caring for the Curtis' meat shop, he also performs other tasks to aid Izumi and the Elrics whenever needed. He helped to gather information for Izumi on Al's whereabouts when he was kidnapped, showing that he does posess an affection for the brothers and when he was not battling the brother's during their training, he helped to care for them and keep them alive, as well as giving them hints on understanding more about the basics of alchemy. Mason has also displayed a fair degree of martial arts prowess and strength, particularly when wielding a club, as well as exceptional survival abilities during his time during the Ed's and Al's training, possibly due to living with Izumi and Sig. It is also possible that he is aware of Izumi's condition and the background behind her ability to transmutate without a transmutation circle, as he quickly and forcibly changed the subject when Ed and Al asked why Izumi never had a child and how she could perform alchemy without a transmutation circle.