Sitri Smart

As the youngest sibling of Liz and Ansem, Sitri Smart used to be a timid and weak girl who lacked confidence until Krai inspired her to pursue alchemy. This encouragement unlocked her extraordinary potential, allowing her to become a top-tier alchemist who once held the title of "Best" before certain incidents led to her being notoriously rebranded with the epithet "Deep Black". While she maintains a polite, cheerful, and well-mannered facade to strangers, she harbors a deeply ruthless and machiavellian nature. She is willing to conduct highly unethical experiments and even infiltrate evil organizations if it means acquiring knowledge to assist Krai. Harboring a profound, borderline yandere obsession with him, Sitri calls herself his wife and constantly orchestrates secretive, highly-funded schemes that ironically hinder his dreams of a peaceful retirement.