Sig Curtis

Sig Curtis 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. He met Izumi when she was 18-years-old somewhere in the northern regions of the country, and both immediately fell in love at first sight. 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. 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 final chapters of the manga, Sig decides to take an active role in helping the protagonists overthrow the dangerous Amestrian government. When Mustang begins his attack against Central, Sig and his wife both aid the Briggs forces against Central troops in the capital. Once inside Central Command, he fights alongside Alex (who he still considers a good friend) against Sloth -- and with all their combined efforts, the Homunculus is eventually killed.

Sig and Izumi make their way down toward the lair of the Homunculi with the Armstrong siblings, hoping to do as much as they can to subvert the enemy's plan before Izumi must escape. However, when the five Human Sacrifices are summoned to Father's side, Sig watched helplessly as his beloved wife disappears into the Gate. After a good bit of searching and after the Nationwide Transmutation Circle is activated and reversed, Sig is happily reunited with Izumi just before the final battle begins. Unable to fight, he stays below while the alchemists and soldiers attack the godlike Homunculus leader on the surface, but at battle's end, he rejoins his friends, happy to see Izumi safe and moved to tears at the sight of Alphonse in his human body.

2003 Anime
In the first anime series, Sig takes a considerably smaller role in the plot. He 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. He was also shown to be able to comically sleep with both his eyes wide open.

In the movie Conqueror of Shamballa, it is Sig who informs Winry that Izumi has passed away.