"Oh sure. How's this pose?"
By which I mean: respond as yourself. Acting like a jerk to strangers because your character is a jerk is not a cool thing to do. If you'd like to say no to the photographer, that is absolutely fine. But if you don't mind the photo, talk like a polite human being. Save the RP snark for joking around afterward.
ULTROS [Final Fantasy VI] (30%)
Haydee Tebelin (manga) [Gankutsuou] (10%)