She [Rose] and Kit have such a great funny girl straight man rapport. The two of them are so good together. You never really know you cast an actor or actress, you just, you don’t know how they are going to be, opposite someone else. The key to this role is the chemistry between Jon Snow and Ygritte. Watching them together, I could have a whole episode with just these two. Just the way they strike that balance between antagonism and attraction, it’s just really, it came to it right out of the gate, there was no false step.
— David Benioff and D.B. Weiss (discussing Kit Harington and Rose Leslie)