His victory dialogue against elite mooks ("Nothin' like a challengin' kill!"; "Yeah, not bad! Not bad."; "Heh; another trophy for my wall.") seem to imply that he regards his enemies as sport, as challenges that he is excited to meet. As opposed to, y'know, people.
Which, when you think about it, is likely what the player thinks of the enemies. Combined with the Painting the Fourth Wall example down below, Mordecai is beginning to look like the in-game personification of the player.
The Gunslinger: Every playable character can use guns and has skill trees relating to them, but Mordecai actually gets a skill tree that's called this, specifically with pistols.
Flash Step: Her special ability allows her to step into an alternate dimension (causing an explosion that helps discourage her enemies from attacking), run quickly to her target, pop out with an energetic shockwave that stuns her foes, and then proceed to mow them all down.
Incendiary Exponent: Her Phoenix skill sets her on fire (with only beneficial effects). It also allows her shots to cause fire damage, acquainting their targets with the Man on Fire trope (with harmful effects).
She is also an expert with elemental guns and can crank the elemental damage done by them Up to Eleven. A Maliwan Hellfire submachinegun turns Lilith into a firebreathing goddess of pure destruction.
Combat Medic: Roland has a skill tree called 'Medic' that helps him heal his allies, but that doesn't mean he's any less capable of shooting you. The tree has other abilities that specifically make him hardier, increases his weaponry's magazine size. and actually has an ability that requires him to kill an enemy to activate it.
...and one of the ways he can heal allies is by shooting them, giving the term new meaning.
Plus he can upgrade his turret to heal allies while unhealing everyone else
There is an insane medic 'build' which is perfect for arena fighting. Getting healed by your turret and a healing boost from killing enemies... Hitting level 45 pretty much allows you to run around in the thick of battle without a shield running from enemy to enemy and shoot them point blank (who cares about weapon accuracy?) for continued ownage. Question is: are you able to reach level 45 in your first playthrough?
Healing Shiv: Roland can access Cauterize, a special ability that makes his weaponry heal allies. The text of the skill states this also works with rockets and grenades.
"Hold still while I heal you..." BRAKKA BRAKKA BRAKKA. "There, all better."
Big Word Shout: Whenever he uses his Action Skill, he will shout one of these three every time he kills someone:
"BLOOOOOOOOOD!"
"MOOOOOOOOORE!"
"KIIIIIIIIIILL!!!"
Dumb Muscle: Barely literate, but is described as having "rhino-like" strength
Good Old Fisticuffs: He can specialize in hand to hand combat. Keep in mind the planet is populated with gun toting road warrior type bandits and assorted monsters. Good thing Brick hits like a train.
Invulnerable Knuckles: Brick can beat alien monsters, bandits with various head gear, and other things to death with his bare hands and not bat an eye. He even regenerates while he does it.
Master of Unlocking: A mild example. Claptraps guard the gates to new areas of the world, and must grant the player access for them to continue.
Robot Buddy: Deconstructed to a degree. The player characters bear no ill will towards the Claptraps, but both the bandits and Lance do. There are multiple side quests involving Claptrap repair, since people tend to use them as target practice. In one of the DLC, one Claptrap goes mad and starts a robot revolution in retaliation for all the mistreatment.
Unreliable Narrator: Marcus narrates the beginning of the main game, the beginning of the Zombie Island and New Robot Revolution DLC, as well as the credits for Zombie Island, in the form of a story for a young child. However, he often messes up details or contradicts himself.
Marcus: The Vault Hunters had stopped the evil doctor Zed from- Child: I thought his name was Ned. Marcus: Yes, yes. Whatever you say. Where was I...
At one point, he explicitly says he is lying when he is talking about Patricia Tannis rejecting him.
It's All About Me: She was overjoyed when her colleague died so she could take his chair, tells you whatever else you are doing is pointless and to drop what your doing to help her, and is all around selfish.
Scooter: Lucky's an old buddy of mine - and by old buddy I mean "asshole what ruined my momma's girl parts". Sounds like he's in trouble so you go on ahead and try and keep him alive long enough so I can kill him at a later occasion.
TK Baha
Came Back Wrong: In the "Zombie Island of Dr. Ned" DLC, he has become a zombie. He doesn't attack the player, though, he just sits in his shack rambling about brains.
Cain and Abel: Subverted as Taylor is just as bad if not worse than his brother, as it would turn out.
Crazy-Prepared: Taylor apparently puts armed midgets in storage containers (complete with beds and toilets) in case he has a sudden need to betray someone.
Anti-Climax Boss: Subverted. He goes down quite easily. Followed by credits rolling past at lightning speed. Then they're suddenly ripped away and Undead Ned screams "It's not over yet!" Along with a character intro screen of Undead Ned with the text "HOLY F*#KING SHIT!!!"
Badass Mustache: One that's apparently growing out of his surgical mask.
Berserk Button: His assistant, Bill, making popcorn when people are trying to work.
Evil Twin: Of Dr. Zed. At first, it can be assumed that Ned is Zed in a ridiculous disguise and who spouts many suspiciously specific denials ("I am Dr. Ned, who is totally not Dr. Zed in disguise."). However, other sources (such as the Game Of The Year Edition Guide and a launch trailer) confirm that they are indeed two different people.
