“Za” is the word for “Yes” so Una is basically saying “Yeah, yeah.” (The “keep your shirt on” is implied.)
Una is a character that I grew to love when developing the personality and back-story. I’m really looking forward to exploring future cast dynamics with Una, Milan, and Lu Pai. Particularly Una and Lu Pai, since they are old friends.
Una is an infiltration specialist, and as such is an expert at disguise and forgery. There are places all over the world where Una has stashed clothing, make-up, wigs, stolen seals, falsified papers, and other tools of the trade. You never know where you might end up for a job. Particularly when the Order is paying.