Cain is the late boyfriend of Rose Thomas and a former resident of the town of Reole. Named only in the 2003 anime, his death and the false promise of his return become the lever Father Cornello uses to bind Rose to his church.
Little is recorded about Cain beyond his youth and his home in the town of Reole. He is a human Amestrian man given a name only in the 2003 anime, where the spellings Cain, Caine, and Kain all surface; the manga and Brotherhood reference him without ever naming him.
The stories dwell far more on the devotion Cain inspired than on the young man himself. Rose Thomas loved him deeply, and it is her grief, rather than any traits of his own, that sets much of the early Reole plot in motion.
Cain was romantically involved with Rose Thomas until he was killed abruptly in an accident. Father Cornello preyed on her grief, dangling the promise of resurrecting Cain to win her loyal service to his church. In the 2003 anime the priest went further, transmuting a chimera parrot that spoke in Cain's voice but could only utter Rose's name, convincing her that Cain had been revived and was simply still recovering. Doubt crept in after Edward Elric was captured, and once Rose uncovered the deception, Cornello sealed her in a room and set the chimera parrot to kill her and silence the truth. Alphonse Elric intervened, destroying the creature and saving her.

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Cain is the late boyfriend of Rose Thomas and a former resident of the town of Reole. He is named only in the 2003 anime, where his death and the false promise of his return become the lever Father Cornello uses to bind Rose to his church.
Cain was romantically involved with Rose Thomas until he was killed abruptly in an accident. His death left Rose devastated and searching for a way to bring him back.
Father Cornello preys on Rose's grief over Cain, dangling the promise of resurrecting him to win her loyal service to his church. In the 2003 anime, he goes further by transmuting a chimera parrot that speaks in Cain's voice, convincing Rose that Cain has been revived.
Cain is referenced in both the manga and Fullmetal Alchemist: Brotherhood but is never actually named in either; he is only given a name in the 2003 anime, where the spellings Cain, Caine, and Kain all appear.
After Edward Elric is captured, doubt creeps in and Rose eventually uncovers Father Cornello's deception about Cain. Cornello then seals her in a room and sets the chimera parrot to kill her, but Alphonse Elric intervenes and saves her.
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