Starfire

Starfire's true name is Koriand'r, she is a Princess of Tamaran, and is in line to become Queen. Her name Starfire is a translation from her true name. Her older sister, as an infant, developed a disease that did not allow her to develop her ability to harness solar energy and thus she lost her right to the throne. This harnessed her resentment for her sister and a very fierce sibling rivalry between the two. The two were sent off to be trained as fighters and during a sparring exercise Blackfire attempted to murder her sister and thus Blackfire was expelled from the school they attended. Blackfire then swore vengeance on Starfire.

Blackfire betrayed the Tamaran planet by telling of her her planets defenses to the Citadel, the Tamarans enemies. The Citadel crushed their planet and Starfire became her sisters slave. She ended up killing one of her captors and was ordered to be captured and executed, but fortunately her sister and her were captured and brought to a Psion research ship, where they were tortured as the slien scientists preformed numerous expirements on them. Starfire was able to escape from the ship, but she went back to save her sister even though her sister was trying to murder her. Her sister wasn't grateful at all and she attacked Starfire as soon as she was released. Thats when Starfire met up with the other members of the new teen titans and they helped her to kill off the people that were chasing her and trying to capture her.
Starfire also has a younger brother named Wildfire. During one of the episodes he was sent to Earth to live with Starfire, but kidnapped by Blackfire, she sent a villian in disguise as him to kill Starfire. Her parents died as a result of thinking that now they have lost both of their daughters.

In tv series Starfire is seen to have a crush on Robin, and their relationship is hinted at, especially when they kissed during one of the episodes. In the comic book series Starfire had already been married twice when Dick Grayson asked her to marry him. She agreed and they were set to be wed, but Raven, who was evil at this point murdered the priest on their wedding day and planted seeds of good in Starfire. Starfire was so overwhelmed by all of the bad she left Earth and broke up with Dick Grayson.