Teer'aa was a female Twi'lek assassin, who operated alongside Seer'aa. Having once been enslaved on Ryloth, they eliminated their owner and subsequently became bounty hunters known as the Twin Suns, utilizing lethal blades and personal energy shields.
In 3951 BBY, while separated from Meetra Surik on Nar Shaddaa, Atton Rand encountered them in a cantina and emerged victorious. Later, Surik and two of her allies confronted them on the Visionary and killed Teer'aa and her associate shortly before the vessel's destruction.
Seer'aa and Teer'aa were born on Ryloth and were sold into slavery when they were young. At some point, they murdered their master, thus beginning their careers as assassins.
Following the Jedi Civil War, the Twin Suns were passengers on the Visionary along with several other bounty hunters. Goto tasked them with capturing Meetra Surik alive, making it clear that death was unacceptable.
They successfully located Surik's companion, Atton Rand, while Surik was in the Jekk'Jekk Tarr. Initially, they attempted to persuade Atton to accompany them peacefully, but they soon resorted to force. Atton managed to defeat them and escape. The outcome of the first encounter angered the duo, so they returned to the Visionary, where they waited for Surik and her friends. They finally got their chance just as the ship was falling apart. They tried to kill Surik, but she and two of her companions killed them. Their bodies were destroyed when the Visionary exploded.
Seer'aa and Teer'aa made an appearance, albeit without names, in the video game Star Wars: Knights of the Old Republic II: The Sith Lords. Leland Chee later revealed their names.
If Atton boards Goto's ship to rescue the Exile, he will express his displeasure at seeing Teer'aa and her partner, promising that they will both be defeated in the upcoming battle.