Sinivali is never described.
Sinivali is a hospitable but serious lyon.
Sinivali is the Co-leader of the one of the Barbari Tribes with his cousin, Iz. Intrigued by her red color and size, they let Uru and her group stay and train with their pride as she readies to face Vireka. He and Iz try and convince her to stay with their pride later, when the pride seer Aloka predicts her future and sees nothing but I'll, but she refuses. Accepting her choice, they give the group rations and then banish them from their lands.