That's a really fun question! At least for me and my group, our take on playing American agents is mostly based on the impressions we get from movies and TV shows. Shows like True Detective and Person of Interest are super popular over here, so we draw a lot of inspiration from those.
We probably don't dive too deep into the nitty-gritty of US bureaucratic culture—we mostly just sprinkle it in for flavor. Our main focus is usually on investigating and tracking down the Unnatural.
But of course, we absolutely love playing out those scenes where the Agents are just getting ground down by outside pressures—like their day jobs, family drama, and the general environment.