Ninja

Ninja (or "shinobi" in historical Japanese) were Japanese covert assassins and spies. They tend to specialize especially in stealth-oriented affairs such as sabotage or infiltration although they are able to competently fight head-to-head. Contrary to popular belief, Ninjas were not lower class people who developed the art of ninjutsu that was considered too underhanded for the Samurai to use. In real life, Ninjas were usually Samurai, or in some rare cases, mercenaries who work for the Samurai.

The art of Ninjas, popularly known as ninjutsu, is nowadays commonly thought of as a secret martial art that was passed on in secrecy between Ninjas and kept secret from the Samurai. However, there is no record of a single Ninja martial art ever being created, let alone used to provide special hand-to-hand combat or weapons skills in direct combat. The Ninja are always referenced as being used to "creep in" or to get information by clandestine methods, and not engage in direct combat. History shows that the "Ninja martial arts" were an invention of the mid-twentieth century, coming from a single source that Japanese researchers today reject as false. The Ninja, being Samurai themselves, most likely used the same martial arts used by the Samurai (karate, kenjutsu, etc). The art of ninjutsu consists of scouting, spying, explosives manufacture, and infiltration tactics; and not head-on combat techniques.

In popular culture, the Ninja suit is perhaps the most recognizable feature of Ninjas: the all-black (sometimes white) outfit which covers a Ninja from head to toe, with only their eyes and hands exposed. However, Ninjas actually never wore the "Ninja suit". The "Ninja suit" actually came from Kabuki theater. The stagehands of Kabuki theater traditionally dress in all-black "Ninja suits" to signal to the audience to ignore them as they were not part of the play (though the stagehands were still highly visible to any who bother to notice them). It became popular to dress actors playing Ninjas in the same outfits as the stagehands, as the audience were used to ignoring the stagehands. The Ninja actors would then suddenly jump out and "kill" a character on stage, much to the surprise of the audience. Nowadays, people tend to think the "Ninja suit" is quite suitable for sneaking about in the dark. Actually, the black outfit is highly conspicuous, even at night. Real Ninjas wore dark blue outfits for sneaking about at night, someone dressed in all black will stand out like a silhouette. However, Ninjas usually just dressed like ordinary people, such as farmers and merchants. That way, they can move about unnoticed, day or night.

In the Mortal Kombat universe, the art of ninjutsu was created in China by the Chinese Lin Kuei clan, and brought to Japan by Takeda, a breakaway member of the Lin Kuei. In real life, this may be partly true, though ninjutsu was most probably not created by the Lin Kuei. Many people may be surprised to hear that the Lin Kuei did indeed exist, though the real life Lin Kuei had little in common with the Lin Kuei in Mortal Kombat. The real life Lin Kuei were not Chinese Ninjas, they were more like a secret monastic order of hardcore survivalists, although there is a mostly discredited theory that they inspired the Japanese Ninja, like in the Mortal Kombat universe.

Ninjas in the Mortal Kombat series
Ninja is a loosely used term in the actual sense of ninjas regarding the Mortal Kombat franchise, thus they are a very prominent group, featuring 25 characters listed under this classification. It is used in an umbrella fashion to those who wear a colored uniform and mask to conceal their face. Common attire is a broad vest that splits apart at the chest area in a V-formation as well as boots or 'tabi'. A short cloth is tapered at the waist area. The attire is completed by a mask to conceal their identity though some of the characters have often removed their masks for deadly purposes. It is not uncommon for a ninja to possess supernatural powers that gives them the edge over their opponents. From Mortal Kombat to Mortal Kombat Trilogy, ninjas were virtually identical to one another in terms of appearance, save for their color choices, poses and powers. From Mortal Kombat 4 onwards, ninjas were given a better sense of diversity with their designs.

Canon

 * Scorpion - He wears a yellow color. Formely known as Hanzo Hasashi. Perhaps the only character in the Mortal Kombat Universe who can actually be considered an actual ninja, Scorpion is the only known member of a Japanese ninja clan, the Shirai Ryu. Formerly known as Hanzo "Sasori" Hasashi, Scorpion is a spectre who rises from the dead to avenge the demise of his family and clan. At first, he had thought the elder Sub-Zero to be the perpetrator until Quan Chi revealed himself to be his family's true killer. Scorpion has since made it his goal to kill Quan Chi, no matter what. Scorpion dresses in yellow shades with a skeletal theme reminiscent of his undead status (e.g lower mask looking like a ribcage in Mortal Kombat vs. DC Universe). He wields a spear weapon which he uses to fling at his opponent and reel him or her in, as well as a set of decorated katana blades.
 * Noob Saibot - He wears a black color. Formerly known as Bi-Han, the first man under the moniker of Sub-Zero and the current one's older brother. Killed by Scorpion, Sub-Zero plummeted into the Netherrealm and became a wraith, maintaining his memories but with no recollection of his past morals as a human. Noob Saibot aims to further his goals of conquest with the help of Smoke's nano-technology to create an army of cyber-demons that will follow his command. He appeared, initially, as a solid black silhouette, and later adorned belts and a tight-fitting suit to fit in with his new-found assassin theme. He possesses the ability to meld with the shadows and other phantom-themed powers, including the ability to spawn black shadows of himself to assist him in battle.
 * Reptile - He wears a green color. Shang Tsung's former bodyguard one of the two lone survivors of the near-extinct Saurian race. He is constantly seeking a worthy master to whom he will serve, showing the utmost loyalty to them. He dresses in green and black garbs, though because of his separation from his clan, he begins to appear less and less like a human and more like a beast, eventually no longer wearing a mask. He possesses abilities inspired by several reptilian creatures.
 * Sub-Zero - He wears a blue color. Real name, Kuai Liang. As the successor to his older brother, Sub-Zero is a member, and later, the grandmaster of the Lin Kuei clan, an organization of Chinese warriors often mistaken as ninjas due to their costumes. Like most clan members, Sub-Zero dresses in blue. From Mortal Kombat 3 onwards, he bears a scar over his right eye. Starting in Mortal Kombat: Deadly Alliance, he wears the Dragon Medallion, an item of great power. And from Mortal Kombat: Deception onwards, he wears armored plating adorned with dragon markings. True to his moniker, he has a master over the element of ice, being descendant from Cryomancers, using it in a variety of defensive and offensive ways.
 * Smoke - He wears a gray color. Real name, Tomas Vrbada. A former Lin Kuei warrior from the Czech Republic who fell victim to, but overcame subjection of, the roboticization process. Sub-Zero's closest friend and ally, Smoke has been reprogrammed by his older brother, Noob Saibot for his own ends. He can do naught but obey the evil wraith's commands. As a cyborg, he wears silver and black armor. Due to the recent reboot, Smoke retains his human form. While his update retains some elements of his human ninja form, he is now depicted without a hood, revealing long white hair swept up to invoke a wispy theme. Smoke possesses incredible speed and the ability to manipulate his intangible namesake for a variety of purposes as well as being able to morph into a cloud of smoke.
 * Ermac - He wears a red color. A ghastly legion of warrior souls fused into one single entity, referring to themselves in the plural form instead of singular. Formerly a pawn of Shao Kahn, Ermac was freed by Kenshi and consequently joined the side of good to atone for what he had done in the name of evil. Ermac dresses in red with a certain warrior theme, and wears a mask completely composed of black, leather ribbon. He has the power of telekinesis and a few soul related powers.
 * Rain - He wears a purple color. A self-proclaimed prince of Edenia and a son of Argus. An orphan who bore witness to the invasion of his home by Shao Kahn's Outworld forces. Once a minion of the ruthless emperor and a willing traitor to his own realm, Rain fights for evil. He dresses in purple garbs with a royal theme. He possesses the ability to control the weather thanks to his half-god heritage, using water and lightning to drown his opponents.
 * Reiko - He wears a Magenta color and no mask. An enigmatic soldier who has served under both the Elder God Shinnok and Shao Kahn, Reiko aspires to one day rule all of Outworld himself, to the point he models himself after Shao Kahn's very visage.
 * Chameleon - He wears a turquoise color. An enigmatic warrior shrouded in mystery. His past and ambitions are unknown to all. Wears a quilted garb that changes colors periodically and has transparent skin. He possesses powers based on many other male ninjas.
 * Tremor - He wears a copper color. A member of the Black Dragon, possible former member of the Lin Kuei, he was defeated by Jax. He has the ability to create shockwaves in the ground much like Jax himself, and the ability to launch fireballs.

Non canon

 * Classic Sub-Zero - Classic Sub-Zero was a playable character in Ultimate Mortal Kombat 3 and Mortal Kombat Trilogy, initially believed to be the live representation of the deceased original Sub-Zero. His biography screen is almost identical to the younger Sub-Zero's in Mortal Kombat II; it states that, though believed killed in the first Mortal Kombat, he is thought to have returned to try and assassinate Shang Tsung.
 * Hydro - He was a younger but close friend of Sub-Zero and journeyed with him to combat the forces of Outworld. His unique talents allowed him to manipulate water. His control over the element allowed him to blast strong waves of water at his enemies. Hydro was killed by Scorpion in Outworld as part of the undead wraith's promise of killing all of Sub-Zero's friends and family before killing Sub-Zero himself. Like Sub-Zero, he wore shades of blue but had a unique variation of the traditional Lin Kuei garb which excluded the black shades.
 * Komodai - Komodai was a male Saurian that invaded Earthrealm. It is not known where he originated from except that he was accompanied by a team of fellow Saurians that broke through a dimensional portal into Earthrealm where they fought the "Defenders of the Realm."
 * Oniro - Oniro was a male human and the Grandmaster of the Lin Kuei before its reformation. It's not known how long Oniro held the title of Grandmaster except that he was present before the order was given to automate their ninja assassins. He was present when both Cyrax and Sektor went through the cybernetic process at which point both Sub-Zero and Smoke refused to take part in. He dresses in white and black robes. but leaves his face exposed. Possesses the ability to shapeshift partially or wholly into dark-colored animals.
 * Yong Park - Yong Park was a former Lin Kuei ninja (the Lin Kuei are described as practicing the art of ninjitsu in the novel) turned toll-taker. He was killed by Sub-Zero twenty years later for leaving the clan, a traitorous act punishable by death. His soul merged with the body of his son Tsui Park to become Scorpion.

Female ninjas
Mortal Kombat II had marked the debut of the kunoichis (in historical Japanese), female counterparts of male ninjas. Unlike their opposite sex, their basic designs change drastically throughout each game. They were first depicted with a leotard, a plain mask, head band and tight skin boots. By Ultimate Mortal Kombat 3, the design changes to a more detailed leotard split in the middle held together by thick threads, a mask, detailed boots and hair tied up in a small bun. As far as abilities go, they are just as lethal in combat as male ninjas, prominently employing the use of weapons in favor of hand-to-hand combat. Their slim, lithe build, combined with their agility and speed makes them much more difficult to handle in kombat.

Canon

 * Kitana - She wears a blue color. The 10,000 year old princess of Edenia. Kitana was adopted by Shao Kahn as his stepdaughter after the invasion of her homeworld and the death of her parents, King Jerrod and Queen Sindel. She eventually rebels against the tyrannical emperor and joins Earth's forces in defeating the Outworld menace. Having rescued the resurrected, but brainwashed, Sindel from Shao Kahn's control, Kitana rules her liberated realm alongside her mother until the events of Mortal Kombat: Deadly Alliance where she was killed. Kitana is then revived under Onaga's control and then set free by Liu Kang and Ermac. Wears royal-blue colored shades, fitting in with her status. She possesses several mystical powers such as flying and teleporting and wields a pair of steel fans in kombat.
 * Mileena - She wears a pink color. The half-Edenian, half-Tarkatan clone of Kitana, created by Shang Tsung to serve Shao Kahn, as well as Kitana's 'stepsister'. As time grew by, her ambitions and resentment towards her original counterpart's status and beauty caused her to take up arms against Edenia. Wears a hot pink uniform. Unlike Kitana, Mileena's attire is much more revealing and decidedly Arabian in style, compensating for the hideous visage she hides with her veil. She possesses a couple of bizarre abilities and a pair of sai during kombat.
 * Jade - She wears a green color. Kitana's loyal bodyguard and closest friend. Jade survived the invasion of their homeworld but stayed in secret. She was later enlisted into Shao Kahn's army to track down Kitana, dead or alive. Choosing her friendship and loyalty over the emperor, she rebels against Kahn alongside her old friend, taking back Edenia. After the Deadly Alliance's triumph over Earth's forces, Jade and Sindel try to locate their fallen brethren, whom had already fallen under Onaga's spell. She wears shades of her namesake, retaining a variation of the traditional Ultimate Mortal Kombat 3 ninja uniform. She possesses, among other abilities, the power to reject projectiles, and wields a steel bo and 'razorrangs' in kombat.
 * Khameleon - She wears a gray/turquoise color. Another mysterious survivor of the Saurian race and searching for Reptile, the only other known survivor of their extinct race. Khameleon almost succeeded but failed when Earthrealm's force triumphed, which had forced Reptile to run into hiding. She later resurfaces during Mortal Kombat: Armageddon in order to exact her revenge towards Shao Kahn, indirectly siding with Earthrealm's forces. Khameleon, like Jade, retains a variation of the Ultimate Mortal Kombat 3 ninja outfit, but wears shades of gray and transparent skin. She possesses the powers of other female ninjas, including their weapons.
 * Tanya - She wears a yellow color. An Edenian traitor, and daughter of an ambassador, she initially allowed Shinnok's entry into Edenia. Has since earned the ire and hatred of Jade. Tanya wears yellow clothes, and has stealth-based moves, such as the ability to turn invisible.
 * Frost - She wears a cyan color. The protege to Sub-Zero, Frost won a competition to join the ranks of the Lin Kuei and took on this position to steal the amulet that heralded leadership of the Clan. She has powers similar to both of the Sub-Zero brothers, to a lesser extent. She often manifests in the ability to freeze the ground near herself or her enemies.
 * Skarlet - She wears a red color. A mysterious character that appeared as DLC in Mortal Kombat (2011). She wears red apparel and features long, red hair, her weapon of choice being a pair of knives. She was based on a glitch that appeared in MKII. Composed primarily of warrior blood shed from countless warriors bound together by sorcery, she is Shao Kahn's personal enforcer, released only for the most dire of tasks. Being made out of blood, she utilizes several blood-related techniques, including the ability to morph into a puddle.

Non canon

 * Ruby - Warrior in Ermac's squad in Defenders of the Realm. She was sent by Shao Kahn to invade Earthrealm and sabotage their ability to enter Outworld. She eventually assisted Earthrealm's warriors in defeating Ermac's forces.

Cyber ninjas
It has never been clear as to how mechanical the automations truly are. In Mortal Kombat 3, a damaged cyborg sparks and the skeleton is revealed. The skeleton is almost completely mechanical, aside from the rib cage and skull. The rest of the body is filled with odd mechanical parts and wires. This was about as complex as the cyborgs were at the time. In Mortal Kombat Gold, it was revealed that the cyborgs wore helmets and retained their faces underneath; Cyrax's alternate outfit and ending revealed this. In Mortal Kombat Legacy, the process shows that the ninjas still retain their humans bodies, although most of their insides have been replaced with wires and other cybernetic implants while having their legs surgically removed and replaced to be able to support the heavy-duty armor that folds onto their bodies when active. Their blood is also drained out and replaced with some sort of oily substance which acts as their fuel. With the exception of Sektor, all cyborgs are installed with slaving protocols that force them to obey orders.


 * Sektor (Unit LK-9T9) - He wears a red color. Sektor was the first to undergo this process of roboticization, and he would prove to be their biggest success. The Lin Kuei programmed the cyborgs to do their bidding, and Sektor's main objective was to seek out and kill Sub-Zero, who left the clan after refusing to be transformed into a machine. Sektor was devoid of a soul, lost all human emotions, and has never succeeded in his mission. He later founded the Tekunin, a group of cybernetic ninjas. He has a red-colored sheen with a more battle-oriented theme and is armed with various missile weapons and a portable wrist flamethrower. In the reboot, he was revealed to be the Grandmaster's very son and because he was in favor of the Cyber Initiative, he was the only converted ninja not to be installed with any slaving protocols.


 * Cyrax (Unit LK-4D4) - He wears a yellow color. Cyrax was the second Lin Kuei warrior who was turned into a cyborg. However, Cyrax was captured by Sub-Zero, reprogrammed, and permanently malfunctioned. He was then captured by Sonya Blade and Jax Briggs, and was partially returned to his human state. In gratitude, Cyrax joined the Special Forces. He has a yellow sheen and is armed with time-delay bombs and an energy net.
 * Smoke (Unit LK-7T2) - He wears a violet color. Smoke was the third member of the clan to transform into a cyborg. After returning from a mission, he and Sub-Zero learned of the Lin Kuei's plans to transform their members into robots. The two fled; Sub-Zero escaped, but Smoke was captured and forced to become a cyborg. He was later captured in Outworld by Shao Kahn's army. Hopelessly imprisoned, he chose to shut himself down. Afterwards, Smoke was found by Noob Saibot and reactivated, along with some tampering of his machinery. The two would form a team called Noob-Smoke. As of now, Smoke is torn between serving his new master and searching for his lost humanity.
 * Cyber Sub-Zero (Unit LK-52O) - He wears a blue color. Due to the changing of timelines by Raiden, Kuai Liang is captured and automated instead of Smoke. Though he temporarily served Shao Kahn through the slaving protocols installed in each cyborg by the Lin Kuei, they were disengaged by Jax after being defeated by Kabal and being brought back to Raiden and his allies, giving Sub-Zero back his free will and again fought for Earthrealm. He keeps his blue coloration and retains his ice powers as usual but appears to be more powerful than the two elite cyborg ninjas Cyrax and Sektor.
 * Hydro / Cyber Hydro - Is a character who appears in Mortal Kombat Legacy

Behind the scenes
In reality, all of the ninja characters in the first three MK games were all represented by a single actor. The original base costume was of a red color to avoid blending in with the blue background used when filming the characters for the sprites. Although this method was used to squeeze in more characters while saving memory space, it incidentally gave the actor more work to do than the others. The ninja actor has to perform a wider array of moves and multiple fighting stances than the others as they would be "portraying" multiple characters at once. Once the sprites were captured, they were digitally recolored, creating color values to be applied to the numerous characters. These values were programmed and coded to be treated as separate character values, having access to certain sprites and individual special moves to create their identities.

Because of this, there is a possibility to 'unlock' access to all of these sprites to any ninja, granting them different abilities by swapping movesets or give them every single special move. This would later be explored by the Mortal Kombat Trilogy hidden characters Chameleon and Khameleon.

Outfits

 * Male Ninjas in the original Mortal Kombat wore loose black gi-like outfits adorned with colored suspenders, leg braces, mask and loincloth. In Mortal Kombat II, the outfit design received a padded texturing and more elaborate leg braces, along with a plated mask. This design would eventually be recognized as the suit design worn by the Lin Kuei. The outfit was substantially redesigned in Ultimate Mortal Kombat 3 (The original Mortal Kombat 3 featured no male ninjas, although Sub-Zero wore an outfit vaguely reminiscent of his Lin-Kuei outfit). For Ultimate Mortal Kombat 3, the suits became skin-tight, the suspenders became plated, and had more colored patterns than its previous incarnation. The Ultimate Mortal Kombat 3 version of the male ninja outfit was eventually classified as the suit worn by the Shirai Ryu, most notably Scorpion (Scorpion was the only UMK3 Ninja to feature a custom skull-shaped mask, although this is often disregarded in all variations of Mortal Kombat 3 for ease of pallete swapping). Mortal Kombat 4 would be the first game to feature individual representations of the male ninja outfit, showcasing Sub-Zero in his MKII attire (which had been recently revamped for Mortal Kombat Mythologies: Sub-Zero) and Scorpion in his UMK3 attire. (Reptile, who had lost his male ninja classification in MK4, could unlock a green version of Scorpion's UMK3 outfit minus the loincloth as an additional costume). Noob Saibot also wore a modified version of his MKII costume for MK4, but when he was replaced with Reiko, it was retooled for the new fighter. Starting with Mortal Kombat Deadly Alliance, the male ninja outfits have become increasingly elaborate in design, bearing only vague visual callbacks to the original male ninja design.
 * Female Ninjas in Mortal Kombat II all wore a simple leotard with sleeves, knee-length booths, a cloth mask and a bandana over loose hair. Unlike their male counterparts, they were recognized as carrying individual weapons. (Jade borrowed Kitana's fans until her appearance in UMK3.) Similar to their male counterparts, female ninjas were not featured in Mortal Kombat 3, but returned for Ultimate Mortal Kombat 3. The female ninja outfit was drastically redesigned for UMK, featuring high-cut boots, an open leotard with a stitch-design, simple gloves replacing the original sleeves, and a face mask along with wearing their hair in a tight bun. Similar to MKII, the female ninja retained their individual weapons, with Jade's fans being replaced with a staff. Although the female ninjas were not featured in MK4 (save a brief cameo by Kitana in a different outfit), Mileena and Kitana returned for its Mortal Kombat Gold update. In Mortal Kombat Gold, Kitana kept her UMK3 outfit, although she no longer wore its face mask. Mileena however wore a simplified newer version of the outfit, with her hair tied in a high ponytail. In the games following Mortal Kombat Gold, the female ninjas began wearing outfits that further distanced themselves from their original ninja outfits, with only some instances of such being references to said outfit.
 * The Cyber Ninja outfit introduced in Mortal Kombat 3 was initially portayed as a simplistic "robot" look. The outfit utilized colored armored plating over a black bodysuit, along with a large helmet that completely encapsulated the character's head. Hair-like wires protruded out of the back of the helmet, while a colored mask-like beak made up its face. All Cyber Ninjas featured an opening compartment on the chest plating, which was seamless until opening. Unlike its flesh and blood counterparts, the Cyber Ninja outfit did not receive a redesign for its following appearance in Mortal Kombat Gold; Cyrax and Sektor appeared the exact same as they had in MK3. Cyrax was the only cyber ninja to appear in Mortal Kombat Deadly Alliance and was the only Cyber Ninja at the time to be redesigned. Cyrax's human-like appearance was stripped down into a more mechanical-looking form, featuring wires and blinking lights on his vaguely-skeletal frame while retaining his original head design. Sektor would receive a red version of Cyrax's redesign for his appearances in Mortal Kombat Tournament Edition and Mortal Kombat Deception, although he was given his own distinct design in Mortal Kombat Armageddon. Like Cyrax, Sektor's design retained his orginal head design. While being designed for Mortal Kombat Deception, Smoke used a gray version of Cyrax's Deadly Alliance design as a placeholder before receiving his actual redesign; Smoke's redesign was considerably more skeletal than Sektor and Cyrax's, and only kept a vague similarity to the original Cyber Ninja head design. (Due to the constant swapping of Smoke's main and alternate costumes in MKD and MKA, there is question as to which of Smoke's outfits is considered the true redesign of his Cyber Ninja design.) In the recent reboot, the Cyber Ninjas now feature drastically different designs from one another, sharing no visual motifs aside from the wire-hair and chest compartments. Although Smoke was not changed into a cyborg in this timeline, Raiden's vision portrayed his cyberized-self as sharing Sektor's new Cyber Ninja design, possibly due to the fact the original Cyber Smoke was a pallette swap of Sektor sprite-wise, although it's worth noting that generic Lin Kuei Cyber Ninjas are also presented as gray color-swaps of Sektor. Cyber Sub-Zero's design is drastically distinct from Sektor and Cyrax, although DLC grants Cyber Sub-Zero his own blue colored version of the original MK3 Cyber Ninja outfit.

DLC information
When Mortal Kombat (2011) neared release, DLC information was made available for those who were planning on preordering the game. Depending of the purchase, the user would get a different costume based on the MK incarnations for the male ninjas and the MK3 incarnations for the females. Jade however, is an exception as her MK3 costume can be unlocked by purchasing the Blu-ray versions of the Mortal Kombat films.

With each DLC character being released, the game was patched accordingly for online users not yet able to buy them, and thus Compatibility Packs were made so that their copy would allow DLC characters still locked to function on their disc when played online. These packs also came with free extra costumes for the ninja characters. As of the first Compatibility Pack, the original MK3 costumes for Cyrax and Sektor were released.

As of the second Compatibility Pack, two more retro costumes have became available for Smoke and Noob Saibot. However, these costumes are modeled after their MKII costumes rather than the more simplistic MK outfits as indicated by their masks.

With the third compatibility pack to come with Rain, two more retro costumes were included: that of Jade and Kitana in their MKII outfits. This is the first time in nearly two decades since these costumes have been used in any form of official media.

In the final compatibility pack for Freddy Krueger, Sub-Zero was given two costumes, one for his human form as a hybrid of his MK3 costume and Classic Sub-Zero from UMK3, retaining the physical appearance of the former while wearing the costume of the later. The other is for his Cyber form which is a blue-colored version of the classic Cyber Ninja outfit introduced in MK3.

In the Vita version of Mortal Kombat, all of the ninjas received a UMK3 version of themselves while some other are given an MKII costume such as Skarlet and Rain.

Trivia

 * Many Male Ninjas introduced in the series began as Scorpion clones. Reptile began as a hybrid of Scorpion and Sub-Zero while using Scorpion's name in MK. Smoke and Noob Saibot began as faster versions of Scorpion in MKII, and the former would remain a clone of Scorpion in subsequent games until the 2011 reboot, while the latter would once again become a Scorpion clone in Mortal Kombat Tournament Edition.
 * Several characters introduced as Ninjas have since broken out of their moldings in subsequent Mortal Kombat releases. In Mortal Kombat 4, Reptile was written as beginning to devolve due to being seperated from his people for so long, and was given a completely new outfit unrelated to the Male Ninja. This same outfit would be applied to Baraka's appearance in Mortal Kombat Gold. Reptile later received a variation of his UMK3 ninja appearance however, which kept the outfit, but retained his now scale-like skin from his redesign. Ermac has greatly distanced himself from his Ninja appearance design-wise, now wearing outfits comprised of black bandages and majestic-looking red robes. Following his expanded storyline, Reiko abandoned his modified Male Ninja outfit for a look reminiscent of Shao Kahn.
 * Despite wearing modified versions of their group's base outfits, Tanya and Reiko, who began as Kitana and Noob Saibot respectively, are generally not counted among the Ninja groupings