Kieran is unshaven with green eyes and dark, shoulder-length hair. When Karen first sees him tied to the tree, she says she "thought O'Driscolls ate babies, but you look like a baby".[5]

Kieran is first seen wearing a fairly standard O'Driscoll outfit consisting of trousers, a white shirt with green stripes, a green bandana, and a knee-length leather jacket which buttons down entirely and has a split down the back side. In addition, he will be wearing black leather gloves, a very worn out hat and brown boots. This outfit will also serve as his winter gear.