Tisis is a Ruthgari noblewoman and a member of House Malargos, one of the richest and most important houses, in the richest and most important Satrapy. She is a Green drafter. She has a heart-shaped face, hazel eyes, light skin even by Ruthgari standards, and has large breasts, earning her the derisive nickname "Teats Tisis." She is described as "astounding attractive."

Tisis is 3 years older than Kip; 19 at the time of The Broken Eye, in which Kip is 16.

According to Tisis herself, she only lasted 17 seconds in the Thresher before pulling the rope.