Dredd: Inhabitants of Peach Trees. This is Judge Dredd. In case you people have forgotten, this block operates under the same rules as the rest of the city. Ma-Ma's not the law. I am the law. Ma-Ma is a common criminal. Guilty of murder. Guilty of manufacturing and distribution of the narcotics known as Slo-Mo. And as of now, under sentence of death. Any who obstruct me in carrying out my duty will be treated as an accessory to her crimes. You have been warned. And as for you, Ma-Ma: Judgment time!
By The Book Judge: Notably, he doesn't use his bike's mounted machine guns on the perps he's chasing at the beginning until they kill an innocent bystander and refuses to execute Kay on 99% certainty of guilt.
Combat Pragmatist: Not afraid to use gas, grenades and flashbangs to get the upper hand. When he gives the warning to a group of perps and they counter that Dredd has less time to comply, Dredd quips "Thanks for the heads up", sets off a flashbang and slaughters them all.
The Determinator: Fights pretty much an entire city block without so much as breaking a sweat. Even after getting shot, he patches himself up and gets back to it.
The Dreaded: The corrupt judges know exactly how dangerous he is and demand one million credits for killing him. Notably, this trope is downplayed compared to the comics, as Ma-Ma and all her gang have no idea of Dredd's reputation, whereas the entire city knows who he is in the comics.
The Faceless: Notably, never removes his helmet, unlike Stallone's version. The one scene in which he doesn't wear it is when he's getting suited up for work, and thus hasn't put it on yet. Even then, his face is never visible.
Good Is Not Nice: He's on the side of the law, but don't expect much in the way of compassion, emotion or even conversation.
Perpetual Frowner: Even though the upper area of his face is never, ever visible, he manages it.
Reasonable Authority Figure: He definitely tries to be one despite his tendencies. He is there to enforce the law, not kill people; it's just that enforcing the law most of the time means killing people. Most notably, he tries to avoid killing a hostage taker.
Early in the movie, he doesn't fire on a van until they run over an innocent pedestrian.
When first arriving at Peach Trees, he has Anderson deliver a verdict to a vagrant, but prioritizes investigating the murders and warns the vagrant to be gone by the time he comes back.
"Can't execute a perp on 99%."
Also, while Anderson lost her Lawgiver, which he told her was a fail offense, he passes her anyway, taking into account her actions throughout the movie.
When two teenagers hold him up, he retaliates by shooting them with Stun Rounds.
Sink or Swim Mentor: To Anderson, and said word for word by the Chief Judge. He spends the movie quizzing Anderson on Judge-related knowledge, including procedures, sentencing, and tactical options, and also has Anderson run point for much of the movie, given that he's evaluating her.
At the same time, however, whenever they breach, he's the first one through the door, since he's the more experienced Judge.
Turn In Your Badge: Does this voluntarily at the end, believing she failed her assessment for losing her Lawgiver, which Dredd told her was a fail. Except he passed her. In the comic sequel, she's still on the force.
Wide-Eyed Idealist: At first. Her motivation to be a judge is to make a difference to the innocent citizens of Mega City One, something Dredd notes is admirable.
Groin Attack: Said to have bit her pimp's penis off in retaliation for her slashed face. For anyone else, this might seem like an embellishment.
Karmic Death: Dredd dopes her up on Slo-Mo before tossing her out a window, just as she did to the drug dealers at the beginning.
Klingon Promotion: She became a drug lord by killing her pimp and taking over his business interests.
Make It Look Like an Accident: Specifically orders her men to abstain from raping or torturing Anderson so they can make it look like she were killed during a "drug-bust gone bad".
Non-Action Big Bad: While she does engage in the occasional torture and mutilation in controlled settings, Ma-Ma herself never engages in personal combat during the film. She does take a turn on the gatling guns, though.