Kemsa is a beautiful, attractive vampire who was originally from the Egyptian Coven before the Volturi killed most of its members. There, she joined the Greek Coven and grew close with Itennu who also survived the Volturi's slaughter.
Along with the Greek Coven, Kemsa and her mate arrived to Forks to aid the Cullens as witnesses to prevent the Volturi from killing Reneesme Cullen who was believed to be an Immortal Child. After the young cross-breed showed her gift, Kemsa became a good friend to her. She was proven not guilty, and the coven had their right to leave.