B-l-a-c-k-f-i-r-e

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. Blackfire is constantly trying to, in some way, do away with Starfire, first with getting her arrested and then trying to marry her to an ooze alien. Blackfire loves fighting her sister and rubbing the fact that she is older and stronger in her little sister's face. The two of them are poster children for sibling rivalry. She has a very sarcastic sense of humor and always hurts Starfire's feelings. Blackfire is also quite vain and loves telling stories about herself. Blackfire is also quite pretty, and she knows it and uses it to her advantage when around boys. This is seen in the episode Sisters when she developed a crush on Robin upon meeting him and tried to gain his attention and affection, but this could also have been a ploy in further isolating her sister.

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Blackfire first appeared when she arrived on Earth in the episode Sisters. She gave Starfire a centauri jewel and pretended to enjoy being reunited with her. Blackfire won the Teen Titans' support by having fun with them and telling them stories of adventures she had throughout her travels in the galaxy. The Titans seemed to like her so much, Starfire was beginning to think they wouldn't need her around anymore. She was especially unhappy with her sister's attempts at flirting with Robin. When Starfire thought of leaving Earth, the Centauri Police showed up and captured her. The Titans rescued her and explained to the Centaurians that they have captured the wrong Tamaranean. The Titans then discovered that Blackfire had framed Starfire for crimes by giving her a stolen jewel from the Centauri System. Blackfire, who was leaving Earth at that exact moment, was defeated by Starfire after her right hand was hit by Starfire's starbolts. She was about to attack again however, the Centauri Police catch her from behind and she's taken to prison, swearing revenge on her sister.Blackfire later broke out from prison and wrested control of Tamaran as its new Grand Ruler. Blackfire attempted to get revenge on Starfire by forcing her to marry Glgrdsklechhh, a hideous alien. This was actually part of an elaborate plot between Blackfire and Glgrdsklechhh; by marrying Starfire to Glgrdsklechhh, he would reward Blackfire with a very powerful jewel. When her ruse was uncovered, Blackfire was once again defeated by Starfire and banished from Tamaran.
Blackfire was one of the only villains missing from the lineup of the Brotherhood of Evil, suggesting that she was not out to get all the superheroes, or even the Titans, but simply to just take out Starfire.