Blackfire

Blackfire is Starfire and Wildfire's older sister, the firstborn princess, and eldest daughter of the long-dead King and Queen of Tamaran. She is the former Grand Ruler/Empress of Tamaran. She serves as Starfire's arch-nemesis. Though she is Starfire's older sister, the two are polar opposites. She also has the optimum qualities of a villain, and she is cunning, deceitful, immoral, sadistic and unremorseful. The two almost never get along well, except when Blackfire tricks Starfire into thinking she's being nice.