Tenel Ka is the Queen Mother of Hapes and a Jedi Knight. She attended the Jedi Academy with Jacen and Jaina when she was a teenager (Young Jedi Knights book series 1-14), and she lost her left arm below the elbow in a lightsaber training accident (Young Jedi Knights Lightsabers. She had to give up her duties as a Jedi when her mother died, becoming the Queen Mother of Hapes (New Jedi Order Dark Journey, Dark Nest Crisis. Her latest sacrifice was to give up her daughter, Allana, to Han and Leia Solo in order to guarantee Allana's safety from the machinations of other Hapan nobles (Legacy of the Force Invincible).
The blue vest, jewelry, and lightsaber are all based off the cover to Legacy of the Force Tempest. Other pictures of Tenel Ka have appeared in Jedi vs Sith The Essential Guide to the Force and The Essential Atlas. She typically has her hair in braids.