Millicas Gremory
Millicas is the son of Sirzechs Lucifer and Grayfia Lucifuge, which makes him nephew to Rias Gremory. While his father holds the title of Lucifer—one of the Four Great Satans—that position doesn't pass down to Millicas, so he goes by the Gremory name instead. As a result, he's second in line to lead the Gremory clan after his aunt Rias.
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