The usual disclaimer: if these are bogus aside from the ten already revealed on Amazon, Mick can go ahead and merge/close it, kill it with fire, etc.

Broken up into three parts for easier quotage. Spoilers -- and cheap offscreen character deaths, natch -- abound, of course.

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Cassie Cage
The daughter of Johnny Cage and Sonya Blade, has a lot to live up to. Her parents were among the few kombatants to survive the wars against Outworld and NetherRealm, and were instrumental to Earthrealm's victories. Cassie is as strong-willed--and occasionally hotheaded--as her mother, and as quick-witted as her beloved dad, which makes her popular within her Special Forces unit. She is tasked with her first leadership role, leading a unit comprised of Jacqui Briggs, Takahashi Takeda and Kung Jin into Outworld to track down an amulet of immense power before it can fall into the wrong hands and lead to the destruction of the realms.

D'Vorah
D’Vorah is of a race called the Kytinn, which populates the island realm of Arnyek. The solitary nature of the Kytinn meant a common defense of their realm was impossible; thus it was conquered and merged with Outworld by Shao Kahn. D'Vorah's loyalty and insightfulness, unusual traits for a Kytinn, led to her quick political rise. D’Vorah becomes tired of Kotal Kahn’s obsession with blood magic and see’s the damage it is doing to his judgment. She eventually rebels and causes a striking, significant blow to Kotal Kahn’s regime.

Ermac
After the defeat of his creator, Shao Kahn, Ermac was commanded by the rightful heir to the throne, Mileena. A portion of the deceased Emperor's soul, which had entered the warrior's body moments after his defeat by Raiden, fused with Ermac and made their telekinetic power increase significantly. A battle for dominance began inside the warrior--a battle that began corrupting all of the souls within, causing Ermac’s body to slowly decay. The corruption led Ermac to begin acting irrationally, leaving him to side with Kotal Kahn and assist the Osh-Tekk in ousting Mileena as Empress of Outworld.

Erron Black
Originating from Earthrealm, Erron Black was a hired gunman who was captured and taken into Outworld during Shao Kahn's invasion by a group of Tarkatans. He escaped and slaughtered them all. Black spent years roaming Outworld as a mercenary before being approached by Kotal Kahn, who had heard tales of his marksman skills and hired him for his services. Knowing of the Black Dragon from Earthrealm, Erron Black began dealing with Kano on Kotal Kahn's behalf during his struggle for the throne against Mileena and became one of the would-be Emperor's top advisors.

Ferra/Torr
The dual being known as Ferra/Torr is mysterious even to their closest allies. It's rumored that Torr and Ferra were Outworld citizens, captured and permanently tethered to each other by the evil sorcerer Shang Tsung in the bowels of his Flesh Pits. They're more likely members of a forgotten symbiotic race, in which the "rider" bonds with a "mount." The rider, Ferra, serves as the de facto brains of the duo, while the hulking Torr is the muscle. It's possible they communicate with each other telepathically, or that Ferra can actually understand Torr’s booming grunts. Found roaming the Tarkatan Wastes by Kotal Kahn’s troops, Ferra/Torr were pressed into service as the emperor’s personal bodyguards.

Jacqui Briggs
Childhood friend to Cassie Cage, Jacqui Briggs is the daughter of Jax Briggs. Trained in the art of kombat like her father, Jacqui became a junior Olympic kickboxer. After being kidnapped at the hands of the Black Dragon to force the Special Forces to aid Kotal Kahn in Outworld, and their subsequent escape thanks to Cassie’s parents, Jacqui enlists in Johnny Cage’s unit and utilizes specialized bionic gauntlets to improve her kombat skills. She vows not to fail in her mission to protect the realms like her father had before her.

Jax
Having been revived after spending several years as an undead revenant in service to the sorcerer Quan Chi, Jax returns to Earthrealm and retires from the Special Forces. However, when his daughter, Jacqui, and her unit discover a plot to release Shinnok from his amulet in Outworld, Jax is visited by old allies Johnny Cage and Sonya Blade who bring to his attention Raiden’s plan to aid the unit and end any attempts of releasing the imprisoned fallen Elder God. Jax heads into Outworld with his old allies to save the unit and to stop the return of such an evil being that would surely spell doom for all of the realms.

Johnny Cage
Hollywood action hero Johnny Cage entered his first Mortal Kombat tournament for the publicity. Raiden observed that the arrogant, loquacious Cage, was "a hero...though he may not yet know it." Raiden was correct, of course: Johnny's martial arts skills were not special effects--and were pivotal in Earthrealm's victory. Johnny Cage defeated Shinnok and helped Raiden imprison Shinnok inside of the amulet. With the threat gone and Earthrealm safe for the time being, Johnny Cage began leading his own special team of Special Forces to help better protect Earthrealm from other worldly forces.