Agent Coulson takes the work very seriously. He certainly has some fun with Spider-Man and the others, but he takes each of their tasks, including when they get involved with the drama club, way too seriously. The adventures that they come up with are really exciting.
You know I grew up on the Batman movies, and they had some terrific actors in, but you know a lot of the other ones - it wasn't always the case that you had people the caliber of Jeff Bridges or Robert Downey, so to kind of show up and work with Jeremy Renner or Robert or with Mark Ruffalo, any of them, Chris Evans, Chris Hemsworth, the caliber of people you're acting with, to me, is really fun. From the first day I started doing scenes with Robert, it's been one of the funnest experiences I've ever had.
As a fanboy myself, one of the fun things about the gig has been every time I get a new script, I get to find out more about his day - to-day life and what goes on and what his relationships are.
Joss Whedon and all the writers of 'Iron Man' and 'Thor' found a way to keep Coulson saying something that keeps you guessing. I'm really lucky because a lot of people play agents and don't get nearly as much fun stuff to do.