I had a conversation with my friend sketches-from-a-dirty-mind about Clint’s personality type over the weekend and we came up with a few things about him. Basically we think Clint’s an 8 on the Enneagram. Clint’s childhood was a rough one, with a dad that he and Barney didn’t get along with. He’s afraid of being controlled or abused by unjust authority figures. To me, that’s why he was skeptical of Steve early on in the Avengers, but trusts him now. It also means that he tries to look out for others that might be tread upon. This manifests mainly in his being a superhero, but also in being a mentor to younger superheroes. All this also means that when people in charge that he trusts let him down, that’s the worst, and he will tell them off. Which he does. A lot. That’s the theory anyway.
Captain America #611, page 3. December 2010. Collected in: Captain America: The Trial of Captain America by Ed Brubaker http://www.amazon.com/dp/0785151206