Back from the Dead: It is currently unknown if the Sub-Zero present is Bi-Han, Kuai Liang, or someone else entirely, but if one of the first two, Sub-Zero was somehow able to have everything that happened to him the last game undone and return to a normal state of living. Ed Boon has simply said he's "A Sub-Zero", but he didn't specify what that meant.
Barbie Doll Anatomy: The X-Ray moves show the characters portrayed this way, continuing the trend from 9. An exception is for Cassie Cage's X-Ray which was been reported to show fully swinging animated testiclesfor her to burst.note Lady characters get a cameltoe version.
Bloodier and Gorier: Even more than 9, which had already set the bar high for the franchise itself.
To add on to that, there's already a shining example: you know Scorpion's Fatality in the very first gameplay trailer? Where he burns a hole through Sub-Zero's body, and Sub-Zero's heart starts hanging down from within his chest? Sub-Zero falls to his knees, and Scorpion cuts his head off. At least, that's where the trailer stopped. From reports of those at E3 2014 who saw the rest of the Fatality, he doesn't cut his opponent's head off at the end. He cuts theirfaceoff, Equilibrium-style. You can see the innards of the head without the face, along with brain dripping out, and a visible sliced in half tongue/larynx/everything as the opponent falls over.
Strangely averted with the damage to player's bodies during a match. Although it could be an attempt to more realistically depict damage during a fight compared to Mortal Kombat 9(where characters could wind up looking like they've been in a car accident after a match,) it's still notably turned down here.
Dialogue Tree: Similar to SNK vs. Capcom: SVC Chaos, the dialogues prior to a fight are unique for each matchup and the characters talk back and forth to each other (for instance Kotal Kahn vs. Raiden will produce the following):
Kotal Kahn: You have no chance, thunder god.
Raiden: Thunder blots out the sun!
Kotal Kahn: Temporarily...
Double Meaning Title: According to Ed Boon, the "X" in Mortal Kombat X refers to the Roman numeral (this being the tenth entry in the main series) and "next", in both the sense of the game's availability on next-generation consoles and, as one of the time periods shown in the story will be that the future, the next generation of kombatants.
Evil Power Vacuum: Ed Boon has stated that several factions in Outworld are attempting to fill the void left after Shao Kahn's defeat in the previous game, and that while Kotal Kahn is the Emperor of Outworld at first, he will not remain the Emperor for the entire game.
Eye Scream: Once again, some X-Ray moves involve the recipient having their skull stabbed or smashed in the eye area.
Fastball Special: Unless the Lackey variation is chosen, Torr uses Ferra as a projectile in some attacks.
Food Fight: The Outworld Marketplace stage has many interactive elements which can be used in order to damage the enemy.
Grievous Harm with a Body: One of the attendees in the Outworld Marketplace can be tossed into your opponent. The same can be said of the corpses bobbing in the water at The Cove.
Hotter and Sexier: Inverted. After the skimpiness of the female fighters' outfits were turned Up to Eleven in the last game, Mortal Kombat X will dial it back so not all of them are as revealing.
Limit Break: The super bar from 9 returns with the same functions (Enhanced, Breaker, X-Ray).
Not-So-Safe Harbor: The Cove. A lot of shipwrecks can be spotted in the background and even many corpses are interactable.
Only a Flesh Wound: X-Rays are back, and like the fatalities, are even MORE devastating than MK9. But the victim still gets up like nothing's wrong after one happens to them.
Pretty Little Headshots: Cassie Cage's Fatality has her draw a pistol, kneecap her enemy, and finish them off with a shot to the forehead (and then stick her chewing gum in the wound), which surprisingly for the series, leaves their head intact. Unsurprisingly, High-Pressure Blood is still in effect with this.
Soundtrack Dissonance: The very first trailer for the game. Would Wiz Kahlifa's "Can't Be Stopped" be the first thing to come into your mind when you think "Mortal Kombat"? No? Turns out a lot of people agree on that.
Stance System: A variation from how they did it from Deadly Alliance to Armageddon. Each character can select one of three different variations to their fighting style when selecting their character, each one giving them certain unique powers or weapons.
Teleport Spam: Raiden as par for the course. But this time, one of his three new fighting styles ("Displacer") is awesomely devoted to this trope.
There Is No Kill Like Overkill: Might set a new standard for the series. Fatalities in this game are often excessive and go far beyond simply just killing the enemy (for instance Raiden's fatality has him shock his opponent through their head so much that their eyeballs pop out and then eventually their head separates from their body; not content with just that, he pops their decapitated head like so many balloons with his lightning).
Unfazed Everyman: Just like the background characters of Injustice: Gods Among Us, the people of the Outworld Marketplace seem to completely ignore the bloody brawl occuring just a few feet away, to the point where an old lady is close enough to be grabbed and thrown... again, to the complete ambivalence of the market at large.