Juliet Brewster

Juliet Brewster was a professionnal mercenary, reincarnated as a powerful demon when she died. She is the progenitor of the Brewster bloodline, and was the most dangerous member of this family before her second death.

Trivia

 * Juliet Brewster is, for now, the antagonist with the biggest body count of all the series. She has killed almost one billion people by destroying the Ice Zone. She is followed by her own son Aaron, who indirectly killed a lot of metahumans when he created the Planetarium.
 * The rule "the child shall betray the parent" applies in this family in a strangely effective way. Her son Karim killed her as a retribution for killing his father, Aaron's daughter Lucy betrayed him by seeking the keys of the Planetarium, and Lucy's daughter Yolanda also betrayed her mother by following Aaron's desires.
 * Another family which seems to follow this rule is the Radames family. Desmond killed his parents, and is killed by his own son later. Coincidentally, Desmond, Aaron and the twins Karim and Malik appear in the same story.