Blackfire (voiced by Hynden Walch) is Starfire's older sister and a villain on Teen Titans.
Blackfire was first seen visiting Starfire on Earth, and after settling in and getting support and admiration from the other Titans, Starfire felt replaced. It was revealed that Blackfire framed Starfire for a crime she committed, and Blackfire was arrested for it. She later broke out of prison, and took control of her home world on Tamaran. Blackfire forced Starfire to marry another alien so that she would get a special powerful gem from the alien. But after Starfire said no, Blackfire and Starfire faught each other, and though Blackfire had the gem's powers, Starfire still won. Blackfire lost her position as ruler and was banished from Tamaran.