Scorpion is a character in the Mortal Kombat fighting game franchise by Midway Games and NetherRealm Studios. A ninja dressed in yellow, his primary weapon is a rope dart, which he uses to harpoon opponents. Since his debut in the original 1992 game, Scorpion has appeared as a playable character in every main installment except Mortal Kombat 3 (1995).

The series' original Scorpion is Hanzo Hasashi (Japanese: 波佐志 半蔵), an undead Japanese warrior principally defined by his quest to avenge the deaths of himself, his family, and his clan. After the death of Bi-Han / Sub-Zero, Hasashi develops a feud with who he believed to be the killer, Bi-Han's younger brother and second Sub-Zero, Kuai Liang, that spans most of the franchise before discovering the sorcerer Quan Chi is the real murderer. While Hasashi has been depicted as a neutral figure focused primarily on seeking revenge, he will side with those who can help him achieve his goals. Following two reboots, Kuai Liang (Chinese: 奎凉; pinyin: Kúi Liáng) becomes the new Scorpion in Mortal Kombat 1 (2023), while alternate timeline variants of Hasashi make minor appearances. Scorpion has remained a pop culture icon, receiving critical acclaim since his debut and frequently appears in media outside of the games.

Scorpion appeared in the first Mortal Kombat as one of three palette-swapped ninja characters, along with Sub-Zero and Reptile. His early origins were revealed by the series' original chief character designer, John Tobias, in September 2011, when he posted several pages of old pre-production character sketches and notes on Twitter. Scorpion and Sub-Zero were simply described as "[a] palette swap for 2 ninjas—a hunter and the hunted," while Tobias also considered the concepts of either one of them fleeing their clan or a "revenge story" involving the then-unnamed characters being part of rival clans. In regards to the game's strict memory limitations, co-creator and programmer Ed Boon recalled: "A lot of attention went into the economics of it, and so we knew that if we could take a character and change their color and use basically the same memory to create two characters, we'd save a lot of money and we'd have two characters."

Scorpion yells one of two taunts — "Get over here!" and "Come here!" — at his opponents when he hits them with his spear. They were voiced by Boon in the games and both feature films, but only one of them ("Come here!") was included in the home ports of MK and MKII due to memory constraints. According to Boon, the second of the character's phrases originated because he thought "it would be funny to have him yell out 'Get over here!' when he [threw the spear]," and he was thus encouraged to get behind the studio microphone and record the taunts. Twenty years after the first MK game's release, Boon included creating the spear move as well as the character itself among his personal high points of the franchise's history, adding: "I remember people sitting in my office all day just doing this uppercut [on a speared enemy] again and again, like 'Oh my God, that feels so good.' It just became the cornerstone of [the game]." MKII saw the debut of the phrase "Toasty!", which was voiced by series sound designer Dan Forden during a variation of Scorpion's "Flaming Skull" Fatality or at random when any of the game's characters landed an uppercut. According to Tobias, it first originated as "You're Toast!", which was a taunt bandied among the designers during game-testing sessions.

Scorpion was given a yellow palette because the developers decided it symbolized fire in contrast to Sub-Zero's ice blue. Their similar appearance but opposite nature "prompted the story behind them being these opposing ninja-clan-type characters." A third ninja swap, Reptile, was added in the third revision as a hidden non-playable character who was outfitted in green and used Scorpion's spear (along with Sub-Zero's freeze) as part of his offensive arsenal; he was devised by Boon as "a cooler version of Scorpion." The original costume was created from a modified ninja-like outfit bought at a Chicago costume shop and was red for filming in the first game, but a different yellow one with a quilted vest and knee-high shin guards was utilized for Mortal Kombat II. This in turn made the other male ninja characters therein—Sub-Zero, Reptile, and hidden characters Smoke and Noob Saibot—palette swaps of Scorpion, with the latter two also using Scorpion's spear when players fought them separately in secret battles. Scorpion and the ninja characters were first played by Daniel Pesina, who was replaced by John Turk for Ultimate Mortal Kombat 3 and the 1996 compilation Mortal Kombat Trilogy, while Sal Divita played the character in MK: Mythologies.

While his ninja-outfit template from the first generation of games has remained relatively unchanged over time, the improved graphics of the post-Mortal Kombat 4 three-dimensional releases have allowed more details to better differentiate the male ninja characters, and Scorpion's costumes were duly enhanced with objects such as two katana swords strapped to his back and his spear attached to a rope tied to his belt in Deadly Alliance, and a set of ornate shoulder epaulets in Deception, in which his alternate costume was a throwback to the two-dimensional MK titles. Scorpion's MK2011 costume was inspired by his namesake, such as the character's abdomen-shaped shoulder pads, the two stinger-handled swords crisscrossed on his back, and the exoskeletal pattern on his hard-shell face mask. Scorpion was included with Sub-Zero, Reptile, and Ermac in a bundle of classic costumes from the first Mortal Kombat that was released as downloadable content for the 2011 reboot. For Injustice: Gods Among Us, he received a new costume designed by comic artist Jim Lee. In the original Mortal Kombat's fighter-selection screen, Scorpion had regular human eyes, as his identity as a resurrected specter was meant to be a mystery, but he was given solid yellow or white eyes for every release thereafter starting with MKII, while actors portraying Scorpion in live-action media such as the feature films and the Mortal Kombat: Legacy web series were outfitted with opaque contact lenses in order to achieve this effect.

Scorpion's signature special move throughout the series has him hurling a harpoon-like spear attached to a length of rope at his opponents. The spear impales his opponents through the chest before Scorpion pulls them in to close range for a free hit. His other incumbent special move throughout the series, save for Deadly Alliance, has been his Teleport Punch, where he flies offscreen during battle and then reappears to strike his opponent from behind. Scorpion additionally gained a new leg-takedown maneuver in MKII that was not well-received (Sega Saturn Magazine called it a "ridiculous" move that "no one ever used"). He was considered a lower-tier character by GamePro in their 1993 MKII character rankings, rating him eighth out of the game's twelve playables and describing both him and Sub-Zero as "formerly a top-tier character [who] doesn't have much of a chance in MKII since all of the male ninjas have some poor matchups," with Scorpion faring the worst against Jax and Mileena.

Ed Lomas of Sega Saturn Magazine described the character as having "simple yet effective" special moves in UMK3 that "make him good for beginners, [which] doesn't stop him from being a useful character," while his "trusty" spear was "perfect for setting up combos." GameSpy, in their Deception walkthrough, described the character as "a well-rounded character that has strengths in combos as well as in special and normal moves." They additionally described the spear as "useful as ever" in Armageddon, adding, "Between [that and his] other special moves ... Scorpion pretty much has everything covered." Prima Games' MK2011 strategy guide considered Scorpion to be well-balanced with no distinct weaknesses or advantages, while winning more than half of his fights against the game's other characters. He is also a playable character for both the versus and story modes in Shaolin Monks, where his move sets in this game are largely identical to Liu Kang's with some original techniques.