He made her exude an aura of sexual appeal, as well as making her attractively cat-like. She had a low, husky, purr-like voice and retractable fingernails, pointed ears with tufts, and golden-yellow eyes with slit-pupils.
Over time, and with the help of Need, she became more humanlike and less catlike, as well as more dependant on herself as a person. She fashioned herself as someone who could stand equal to Herald Skif as a partner, so that they could be together without him needing to protect her all the time.
When Falconsbane was finally destroyed once-and-for-all, both Nyara and An'desha (whose body Falconsbane had taken over) were mostly returned to their original forms, with the exception of their eyes and some smaller features.