Tenel Ka was a female Hapan Jedi apprentice. She was the Queen Mother of the Hapes Consortium.
During the Yuuzhan Vong War, she, and then Jedi Knight Nathaniel Kenobi Solo, went to the planet Taris to help the people evacuate before the Yuuzhan Vong invaded. While helping an elderly Cathar woman, Tenel and Nathan were shot by tranquilizers and were captured by Trandoshan Peace Brigaders.
One of the Brigaders was Nathan's future apprentice, Zossk Sadeet. Tenel and Nathan were able to convince her to set them free and the trio took over the Trandoshan ship before they could bring them to the Yuuzhan Vong.
She was one the only Jedi to sense something "bad" about the two Peace Brigade members they were using to gain transport to Korriban: Maka Jeth and Duwingo. After their betrayal, she was quick to mention this.
Their group was attacked by Darth Mutatos's alchemal animals and was forced to flee into the Tomb of Ajunta Pall. There, they saved a ghosting Nathan, whose group had been captured by the Sith followers.
Tenel helped Valin overcome his fear for his sister, Jysella Horn, and his anger to Nathan for losing his sister.
She assisted Nathan, when he went in search of new lightsaber crystals and helped kill the terentatek there.
With Jaden, she went in search of the captured Jedi and found Zekk, Jovan Drark, and Lowbacca clinging to life. She contacted Nathan through the Force, because he was inside of the Court of Yun-Coria.
After helping to heal them, Tenel helped Nathan and the combined species against Mutatos and the Yuuzhan Vong forces on Korriban.
After the defeat of the GFFA, Tenel admitted any surviving Jedi and GFFA members to join a new government, called the Galactic Commonwealth.
She and Nathan were some of the leaders of the Battle of Ruusan.
It was rumored that the Queen Mother and Grand Master were romantically involved, but since there was not any "biological proof" of this, it is passed as pure speculation.