Sig Curtis

Sig is the large, doting husband of Izumi Curtis. Together with his wife, he runs a Meat shop in Dublith and housed Edward and Alphonse Elric during their alchemy apprenticeship, though he himself is not an alchemist. Despite his perpetually angry-looking face, Sig is quite a nice person and laments the repellent nature of his visage. He is very devoted to and protective of Izumi, constantly worrying about her bad health and often needlessly rushing to her rescue when he senses danger (as he did when she was approached by Ulchi at Devil's Nest and when she was "stabbed" by Van Hohenheim ) and becoming jealous when Izumi speaks fondly of other men. He has also been shown to be able to sleep with his eyes wide open. Sig has mentioned that he blames himself for not realizing sooner that Izumi had been experimenting with Human Transmutation.

Sig takes great pride in his significant musculature, pitting it against that of Alex Louis Armstrong. As a result, the two bonded in what Mason referred to as "a friendship forged from muscle."

In the first anime series, Sig warily supports Izumi's attempt to reconnect with Wrath, though afraid of her being hurt in the process and implies that he had made the decision to abort Izumi's natural childbirth when it appeared that she would not have survived the labor.

In the manga series he helps Izumi and the Armstrong siblings in fight against Sloth.