Major Arzen is the central antagonist of Fullmetal Alchemist: The Prototype.
Personality wise, Arzen shares many traits with both Father Cornello and 1st Lieutenant Yoki. Like Cornello, he uses an incomplete Philosopher's Stone to further his own agenda, in his case, fabricating an immortal body for himself. Though, while in the original story, the townspeople adore Cornello, Major Arzen is universally panned as a "greedy bastard".
His role is more similar to Yoki's, ruling over a poor town with absolute authority, although, unlike Yoki, he is always completely callous and never at all comedic.
(Source: Fullmetal Alchemist Wiki)
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