Joiya appeared to be a handsome woman, with a friendly, motherly face, dark gray eyes and dark hair.
Joiya was not particularly strong in the One Power. Her level of strength is described by "The Wheel of Time Companion" as 28(16) which is a middle level in Aes Sedai hierarchy.
Joiya was 171 years old when she died. She was born in 828 NE and went to the White Tower in 844 NE. After spending nine years as a novice and eleven years as Accepted, she was raised to the shawl in 864 NE.
She was held prisoner in the Stone of Tear and questioned by Egwene, Nynaeve al'Meara and Elayne Trakand on the whereabouts of the Black Ajah now. She told them they plan to use Mazrim Taim as a False Dragon and unleash destruction on all the nations but to call himself Rand al'Thor. Because she was still bound by her oaths to the Shadow, she could not tell the truth about this.