is a member of an alien species known as “Irathients
”, and is essentially the deputy to lead character Joshua Nolan
. She is played by actress Stephanie Leonidas
. Smart, independent and feisty, Irisa still struggles with the weight of her unusual upbringing. A drifter since birth, she only stays in Defiance due to the loyalty she feels for Nolan.
Nolan rescued Irisa at a young age and has encouraged her to leave behind her traumatic past. The two have been inseparable ever since, and Nolan has said that Irisa is a war orphan that he found abandoned in what was once Denver. However, it has been hinted at that she and Nolan have something of a dark history that will be explored more deeply as the series develops.