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A general of Rigel. His father, who died young, was Emperor Rudolf’s younger brother, making Berkut nephew to Rudolf. As a child, he was so timid that even riding a horse would make him cry. But, his mother raised him strictly so that he would not be teased for not having a father and so that he would become a great man worthy of becoming the next emperor. As a result, he developed his ideology that the nobility must take pride in one’s lineage and strength. His mother passed away before Berkut reached adulthood, so Rinea has taken her place in his heart as his support.

Both his view of Emperor Rudolf as a surrogate father figure and his interest in devoting himself to the military came from his strong desire to be recognized as the next emperor.