Good Scars, Evil Scars: His torso is crisscrossed with scars from where he was cut by knives while a prisoner of war. In the third and fourth movies he also has a burn mark on his cheek from when a Russian interrogator touched him with a red-hot knife in the second film.
Heroic BSOD: Has a major one at the end of First Blood.
What Happened to the Mouse?: In the fourth film, Trautman only appears briefly in a flashback scene. It's never mentioned what happened to the character following Rambo III. This was probably done out of respect for actor Richard Crenna, who passed away in 2003.
Hero Antagonist: He is performing his duty defending the well being of his town, after all, and still genuinely believes so as he goes about at the expense of Rambo.
Subverted somewhat since he's also The Bully to a certain extent, as the reason Rambo goes on his rampage in the first place is because of how he and his deputies mistreated him for no good reason. Played straight only in that after Rambo goes nuts, he needs to be taken down.
Jerkass: Even though he believes he's doing his duty, he does seem to enjoy throwing his weight around.
Karma Houdini: Despite whatever justification he had, the fact remains that none of the violence in the film would have happened if he just left Rambo alone. And while Rambo winding up in labor camp afterwards was not entirely undeserving, Teasle's role in the affair was most likely overlooked by the public and wound up being hailed as a hero. He's not a true Karma Houdini, though, since he does get shot up pretty bad at the end.
Knight Templar: Feels he has his town's best interest at heart when he uses heavy-handed protocol against vagrants.
There Is No Kill Like Overkill: Schoolboy's weapon of choice is a Barrett .50 calibur anti-material rifle, which was designed for disabling lightly-armored vehicles. Natrually, the effect such a large round has on a human body is rather horrific.
Token Good Team Mate: The only unambigously kind-hearted and unselfish person in the band of mercenaries rescuing the missionaries.