The characters in ''VideoGame/NinjaGaiden'' introduced during the UsefulNotes/NintendoEntertainmentSystem trilogy and the modern series.

'''Many unmarked spoilers ahead: you've been warned.'''



!!Debuting in the original ''Ninja Gaiden'' trilogy
[[folder:Ryu Hayabusa]]

-> Voiced by: Creator/HideyukiHori (JP), Justin Gross (EN - ''Ninja Gaiden''), Creator/JoshKeaton (EN - ''Ninja Gaiden II''), Creator/TroyBaker (EN - ''[[VideoGame/DeadOrAlive Dead or Alive: Dimensions]]'' ''Dead or Alive 5'', ''Ninja Gaiden III''), Creator/KeiichiNanba (JP - {{OVA}})
-> Debuting in: ''Ninja Gaiden'' ([[VideoGames Arcade]])

Protagonist of the series and heir to the "Dragon Ninja Clan", Ryu Hayabusa is the eponymous example of a modern day ninja. His black falcon outfit's sleek design is reminiscent to that of the modern special ops agent; still, his tabi boots, ninja head piece, mask, scarf and shin/forearm guards are representative of the ancient ninja warrior. In great contrast to his deadly appearance, beneath the mask lies a handsome man capable of gentle expressions even, while still in his early 20s, Ryu's personality is that of a wise, composed man far older than himself. With this level of maturity, Ryu is perfectly able to act gentle and caring towards his relatives and friends, and very cold and deadly towards his enemies without hatred.
* AnimalMotifs: The falcon, specifically the peregrine falcon.
** MeaningfulName: "Hayabusa" is the Japanese name for the bird.
* {{Animorphism}}: Shown in the first Xbox game's ending where he leaves by transforming into a falcon.
* AntiHero
** "{{Nominal|Hero}}" or "{{Unscrupulous|Hero}}" at his worst, but mostly the "{{Classical|AntiHero}}" type: Ryu in the modern trilogy is pretty much established as this. Although he does have a strong sense of justice in his mission to punish evil, he has no qualms about killing ninjas from other clans and soldiers alike; in fact, it's made clear he ''has no hatred nor even a slight dislike'' towards any of them (only some Fiends get to provoke Ryu's wrath). Ryu faces this as the harsh reality of a ninja's upbringing - death is a natural part of their world even against friendly rivals.
*** A notable mention goes to the first ''Ninja Gaiden'' for Xbox: in the first mission, Ryu ''slaughters'' as many ninjas as he can find for his training routine, and they were from a ''friendly clan'', [[spoiler:despite Murai turning out to be the BigBad, but Ryu didn't take this into consideration then]]; the first ninja Ryu ambushes is also his first kill in the game. Ryu's reaction to his fallen foe is that of simple acceptance, since it was the right thing to do and the fallen ninja wouldn't live much longer anyway if he was that weak.
*** In the sequel, after having mowed down hordes of Black Spider Clan ninjas and Fiends, Ryu still pays his condolences to all the fallen who went against his clan and then walks away for his next mission.
** ''Ninja Gaiden III'' uses this trope as its primary theme: as a "Japanese dark hero", Ryu's remorseless "cut down the many for the sake of many more" routine is coming back to bite him in the ass due to the "Grip of Murder" curse that relates to the amount of lives he's taken throughout his life. In one scene, a mercenary begs not to be killed because he has a family to go home to. While it seems the game tries to give the player the option of taking a life, the button prompt says otherwise and Ryu cleaves him in two.
*** Perfectly {{Lampshaded}} at the end of ''Ninja Gaiden III'' by one character:
--> "You are not a murderer. You're not exactly a hero, either. Guess that's what it means to be a {{ninja}}."
* BackFromTheDead: Quite instantly after being killed by Doku in the first Xbox game, albeit it takes months for him to recover completely.
* {{Badass}}: One the poster boys for {{Ninja}}s in VideoGames.
* {{BFG}}: "Howling Cannon" in ''Sigma II''
* {{BFS}}: With the exception of ''Ninja Gaiden III''/''Razor's Edge'', one per game in the modern trilogy - "Dabilahro", "Dark Dragon Blade", "Emma's Fang" and "Unlabored Flawlessness"
* {{Bishonen}}: Ryu's design for his ''Dragon Sword'' appearance, adding to the fact it was the first time he appeared unmasked outside the ''Dead or Alive'' series after Tomonobu Itagaki's new direction of keeping Ryu always masked in his main games. ''Ninja Gaiden III'' reveals his whole face as much as possible in cut-scenes.
* BowAndSwordInAccord: Just as the "Dragon Sword" is his primary weapon, he uses bows often as his long-range weapon.
* CelibateHero: Within the modern trilogy, Rachel and Sonia are obviously interested in him, yet Ryu shows no affectionate response towards any of them. It might be a case of respecting {{Continuity}} and Ryu will eventually fall in love with Irene Lew later, [[spoiler:especially since "Sonia" is Irene's alias]], or it's an entirely new {{Continuity}} and Ryu won't fall for anyone since there's some FlipFlopOfGod regarding the present games being {{Prequel}}s for the original trilogy or a completely [[AlternateUniverse new setting]] with no relation to previous titles.
** Worth noting is most of the flip-flopping came from Itagaki: now that he has no relation to the series and Yosuke Hayashi has given some {{Continuity nod}}s to the original trilogy, Irene might avert this with Ryu.
* CharlesAtlasSuperpower: Subverted - Ryu did train intensively to reach the level of Master Ninja, [[spoiler:but his clan ''is'' in fact descended from Fiends, which gives him power above other ninjas; this also explains why Doku nearly succeeded in turning him into one]]. Plus, he can wield a massive battle {{a|nAxeToGrind}}xe/[[DropTheHammer hammer]], a [[{{BFS}} great sword]] explicitly said to be 100 pounds in weight, and a [[SinisterScythe gigantic scythe]] stolen from a Greater Fiend twice his height.
* ClearMyName: The kicker in ''The Ancient Ship of Doom'', as he's accused of assassinating Irene.
* CrazyEnoughToWork: In ''Ninja Gaiden III'', when Ryu's allies realize a fighter jet can't reach the Black Narwhal in time (it doesn't have enough fuel), Ryu proposes to ''jump between two jets on the way''. [[spoiler:Robert T. Sturgeon]] doesn't fail to lampshade the madness of such a maneuver.
* DeathIsCheap: After being killed by Doku, Ryu resurrected as fast as he died.
* ElementalPowers: With his Ninpo techniques
** PlayingWithFire: Fire Wheels, Fire Phoenix, {True} Inferno, Fire Dragon
** AnIcePerson: Ice Storm
** RazorWind: Wind Blades
** PowerOfTheVoid: Piercing Void
* FightingWithChucks: Ryu can pick up and use a standard pair in the Xbox ''Ninja Gaiden'', but later gains access to a pair of "Vigooran Flails", a bladed variant; the latter returns throughout the modern trilogy.
* FriendToAllChildren: All of the kids in the Hayabusa Village look up to him, and his treatment of Canna in ''Ninja Gaiden III'' is positively endearing.
* GoodIsNotSoft: He fights for good, but he's perfectly willing and able to kill or otherwise maim his adversaries.
* GreenEyes: A contrast with his Japanese heritage. Its tint of color tends to vary from game to game.
* HandWave: At least in ''Ninja Gaiden III''
-->'''Mizuki [=McCloud=]''': "How did she [Ayane] know about this place? It's classified top secret…"\\
'''Ryu''': "Ninja have their ways."
* HappilyMarried: With Irene as of ''Dead or Alive''; later games attempt to make it ambiguous by only going as far as to state they're still together.
* [[index]]ImAHumanitarian[[/index]]: The ninpo "Art of the Fire Dragon" in ''Ninja Gaiden III''/''Razor's Edge'' allows Ryu to turn into a giant flaming dragon that eats all regular {{Mook}}s on screen, restoring {{Hit Point}}s.
* ImprobableAge: Ryu reached the rank of Master Ninja in his early 20s while other known masters are middle-aged or older. Not only is he the strongest in his clan, but {{Continuity}} (all the way to ''Dead or Alive'') places him as the single most powerful ninja in the world.
* InformedAttribute: The fact he became an antique shop owner in ''Dead or Alive'' was carried over from the OVA, and even then it's only mentioned briefly in his bio. We don't actually get to see him running the shop, or see the shop itself for that matter.
* JackOfAllStats: When he wields the Dragon Sword, Ryu is this, as the blade is meant to be a balanced, go-to weapon for any occasion. Of course other weapons can be better, [[DifficultButAwesome provided players know how to use them]].
* KatanasAreJustBetter: Quite literally, as despite a vast array of weapons Ryu finds, the Dragon Sword proves itself to be the best overall. Later justified since the "[[InfinityPlusOneSword True Dragon Sword]]" is the only weapon InUniverse capable enough to destroy Archfiends.
* LightningBruiser: Mostly evident with the True Dragon Sword (whether by its own or [[DualWielding paired with]] the "Blade of the Archfiend"), allowing him to TeleportSpam and deal ridiculous amounts of damage in seconds. However, he also qualifies with most of his other weapons when fully upgraded.
* LockAndLoadMontage: A cut-scene following Chapter Two in the Xbox ''Ninja Gaiden'' shows Ryu is tightening the straps on his outfit and bringing three kunai with him.
* MurderIsTheBestSolution: He kills without a flicker of mercy or remorse; exemplified in the first level of ''Ninja Gaiden III'', where players can have Ryu slaughter surrendering mercenaries, with at least one of them getting brutally sliced apart as a part of a mandatory event.
* NeverSpeakIllOfTheDead: Despite having been sworn enemies with Genshin up to his death in ''II'', he is absolutely ''furious'' at Elizébet when she defiles Genshin's body and insults him.
* {{Ninja}}: Arguably '''THE''' most popular and iconic video game ninja of all time; in fact, he is the [[TropeCodifier codifying]] [[Pantheon/ProfessionOverdeitiesAndGreaterGods example]].
* NotSoStoic: He can show brief bursts of anger, although both occurrences happen when he is cursed. In the first game, after thinking the curse is lifted, only for it to come straight back, [[UnstoppableRage he shouts at the top of his lungs in anger]].
* OutOfCharacterMoment: In the OVA, Ryu claims he would abandon his duties as a ninja in his clan if it would mean being with Irene forever. Contrast how he's portrayed elsewhere as he's bound by duty and honor. May double as a ScrewDestiny.
* AProtagonistIsRyu: One of the most iconic cases in the video game medium.
* RedRightHand[=/=]TaintedVeins: In ''Ninja Gaiden III'', the Regent of the Mask curses him with the Grip of Murder, forcing the Dragon Sword to be absorbed by his right arm. It corrupts Ryu's body with the pain and hatred of all the people he has killed, and the curse will kill him within a few days; [[spoiler:all this is a scheme done by the "Lords of Alchemy" to cleanse the Dragon Sword of its corruption and use it to awaken the Goddess]].
* [[SeanConneryIsAboutToShootYou Ryu Hayabusa Is About To Stab You]]: The cover of ''The Ancient Ship of Doom'' shows Ryu pointing his sword at the viewer. The first NES game and ''The Dark Sword of Chaos'' are less aggressive, showing him holding a kunai towards the viewer or unsheathing a sword at the viewer. Covers for the modern trilogy give him much more relaxed, almost casual poses.
* SinisterScythe: The Vigoorian Flails are essentially nunchucks with scythes on them. Naturally, the "Eclipse Scythe" is this trope, while a more traditional kusari-gama is added in for ''Ninja Gaiden II''.
* SleevesAreForWimps: {{Lampshaded}} in the Antarctic level of ''Ninja Gaiden III''
-->'''Clifford "Cliff" Higgins''': I wanted to ask you, Hayabusa… aren't you cold in that outfit?\\
'''Ryu''': [[TheStoic No]].
* SpinningPiledriver: Ryu is probably the most iconic user of this move in modern {{Action Game}}s. Aside from the "Izuna Drop", there are variants from other weapons such as the "Underworld Drop" and the "Flower Garland Drop".
* SpyCatsuit: The Xbox ''Ninja Gaiden'' gives him a sleeveless {{Ninja}} version (coupled with ScarfOfAsskicking and CoolMask to boot), and it's been his default costume here and in ''Dead or Alive'' ever since. Although the design changed in the details from game to game (especially obvious regarding forehead protection), it has become his most iconic look.
* StockNinjaWeaponry: Kunai, shurikens, claws, nunchaku and kusari-gama. The subversion would be the Dragon Sword, as it's a katana rather than a ninjato.
* TheStraightAndArrowPath: Goes up against opponents who wield machine guns or rocket launchers with nothing but a trusty bow, and more often than not comes out on top. He can even take out tanks and helicopters with it!
* TrickArrow: Lightly used in the first Xbox game with armor-piercing and explosive varieties.
* TheUnfettered: In everyday life, he's a pretty NiceGuy, if a bit [[TheStoic stoic]]. When he's on a mission, however, absolutely nothing, let alone emotions, will get in his way. Enemy {{Mook}}s dropping their weapons and pleading for their life won't them.
* WiseBeyondTheirYears: In his early 20s, yet his temperament and wisdom are more of a man ''three times'' his age.
* WorldsBestWarrior: Ryu is considered the "Super Ninja" among {{Ninja}}.
* TheWorseningCurseMark: Suffers this in ''III'' after being afflicted with the Grip of Murder, which forces him to endure all the pain of those killed by his Dragon Sword, and will eventually kill him. It initially manifests as a literal RedRightHand, but as the game progresses, it spreads until, by the final mission, it's covered his entire right arm, part of his face, and [[RedEyesTakeWarning one eye]].
* WolverineClaws: The Falcon Talons
* YouKilledMyFather: Ryu's motivation to fight Jaquio in the first NES game. All the more depressing because [[spoiler:his father, transformed into the Masked Demon by Jaquio, was a boss that Ryu had to fight and although he didn't end up killing him, his father still pulls a HeroicSacrifice from Jaquio's attack, pulling this straight]].


[[folder:A. Foster]]

-> Debuting in: ''Ninja Gaiden'' (NES)

One of the head honchos at the CIA's "Secret Auxiliary Unit" and Irene Lew's immediate boss, A. Foster is a corrupt CIA agent obsessed with power, particularly demonic power. He attempts to coerce Ryu to fetch the Demon Statues for him in the first NES game. Foster shows his manipulative, ungrateful side when he orders Irene to assassinate Ryu and bring the statues back to him; not getting what he wants and with Ryu still alive, Foster shows up again in the third NES game (second chronologically) ''The Ancient Ship of Doom'', plotting his "Biohazard" plan. His goal is to create a race of super-beings, and is indirectly responsible for Irene's temporary death, which sets Ryu in full force against him. [[spoiler:Unfortunately for Foster, H.P. Clancy double-crosses him at the last moment and is killed]].
* BigBad: Of ''The Ancient Ship of Doom'' [[spoiler:at first]]
* CIAEvilFBIGood
* EvilutionaryBiologist: Plans to use the dimensional energies of Castle Rock Fortress to create a race of energy-infused superhuman mutants.
* {{Frameup}}: He creates a clone of Ryu and uses it to kill Irene. [[spoiler:She survived the assassination attempt]].
* SharpDressedMan
* TheUnfought: Although some speculate he's the boss of the sixth level in ''The Ancient Ship of Doom'' in a mutated form, it's really Ryu's Bio-Noid clone because of the way it refers to Ryu as the original.


-> Debuting in: ''Ninja Gaiden II: The Dark Sword of Chaos''

The main antagonist of the second NES game ''The Dark Sword of Chaos'' and a warlord, Ashtar is the self-proclaimed "Emperor of Darkness". Said to be both a skilled warrior and powerful sorcerer, Ashtar is well over six feet tall, and dressed in bulky body armor. With a cape draped over his shoulders, his face is concealed by his helmet which has three spiky horns protruding from the top and both sides of the head. His mask appears to depict himself crying TearsOfBlood. As a parallel to Ryu's Dragon Sword, Ashtar wields the "Demon Sword", a blade forged from the bones of a demon.
* BigBad: Of ''The Dark Sword of Chaos'' [[spoiler:at first]]
** BiggerBad: To Jaquio; when he first confronts Ryu, he claims Jaquio was merely his subordinate, and he was the true power behind his actions.
* CardCarryingVillain: Not only does he call himself "The Emperor of Darkness", he also wants to obtain the "power of Almighty Evil" and have evil demons TakeOverTheWorld.
* DiscOneFinalBoss: [[spoiler:Is fought at the end of Act V in the second game; defeating him and you discover Jaquio is still alive]].
* EvilCounterpart: Of Ryu - both wield legendary weapons and are the champions of their respective clans.
* MagicKnight: Don't let that heavy battle armor fool you - his magic spells are formidable.
* {{Malevolent Masked M|en}}an: Never seen without his scary white mask that leaves only his eyes visible.
* ObviouslyEvil: From his clothes alone, it obvious he's a villain; if that's not enough, his first appearance in the game during a dark, stormy night at the top of a castle, talking ominously to a subordinate about Ryu.
* ReallySevenHundredYearsOld: Ashtar was there when the Dragon Sword and Dark Dragon Blade were forged, and that was at least a millennium ago.
* SpikesOfVillainy: His armor sports these
* ShouldersOfDoom: Ashtar rocks an impressive set of shoulder pads
* TinTyrant: He goes around decked in full battle armor
* VillainTeleportation: During the battle against him, he can reappear anywhere in the room with energy balls closing on him and possibly damaging you.


[[folder:H.P. Clancy]]

-> Debuting in: ''Ninja Gaiden III: The Ancient Ship of Doom''

Foster's accomplice in ''The Ancient Ship of Doom'', H.P. Clancy helped trigger many of the events during the game. Clancy built the Castle Rock Fortress over the ruins of Jaquio's fallen temple, as he and Foster found a continuous supply of life energy within the ruins; Jaquio's downfall left traces of evil surrounding the site, thus the fortress was built to harvest the energy as a power source, and used it on humans for experiments. He seems remorseful for this, however, as he eventually recruits Ryu to take down Foster. [[spoiler:This turns out to be part of his plan all along--he ends up betraying Foster by taking full control of the dimensional warship within the castle ruins, merging with the ancient craft. His ultimate goal turns out to be the destruction of humanity, which he hates for .]]
* AdamAndEvePlot: [[spoiler:He all but outright promises Ryu that he can bring Irene with him when doing his WeCanRuleTogether speech]].
* AmazingTechnicolorPopulation: [[spoiler:After absorbing the power of the life energy]]
* CoresAndTurretsBoss: [[spoiler:Clancy's second form]]
* TheDragon: To Foster
** DragonWithAnAgenda: However, he doesn't agree with Foster's ambition, so he helps Ryu sabotage his plans.
** DragonAscendant: [[ he can put his ''own'' plans into motion by hijacking control of the dimensional warship within the castle ruins, merging with the ancient craft to become the FinalBoss of the game]].
* EvilutionaryBiologist: It's implied that he's the genius behind the process of mutating humans by exposing them to life energy.
* HumansAreBastards: [[spoiler:He believes in this philosophy, citing humanity's warlike tendencies, which might explain why he worked for Foster in the first place]].
* ManOfWealthAndTaste: Like Foster, he also sports a classy suit.
* MotiveRant: [[spoiler:He talks to Ryu about his hatred for humankind before their battle]]
* OneWingedAngel: [[spoiler:Does this ''three times in a row'']]
* PowerFloats: [[spoiler:Clancy's first form]]
* RedEyesTakeWarning: After being transformed by the life energy
* ShoutOut: His name could be a reference to American novelists Creator/HPLovecraft and Creator/TomClancy.
* SayMyName: Does this to Ryu [[spoiler:before assuming his third form]]
* WalkingSpoiler: Knowing Clancy's full role in ''The Ancient Ship of Doom'' reveals a few key {{Plot Twist}}s.
* WeCanRuleTogether: [[spoiler:Attempts to goad Ryu into joining him before their final battle]]


[[folder:Irene Lew]]

-> Voiced by: Amanda Troop (EN - ''Dead or Alive: Dimensions''), Creator/YumiTouma (JP - OVA, ''Dead or Alive: Dimensions'')
-> Debuting in: ''Ninja Gaiden'' (NES)

Heroine of the NES trilogy and Ryu's primary LoveInterest for the whole series, Irene Lew is an agent of the CIA's Secret Auxiliary Unit, working under the CodeName "Sea Swallow". Despite her status as an agent, Irene is more of a support for Ryu as she often finds herself captured and winds up being rescued by the Dragon Ninja. When she disregards Foster's orders to assassinate Ryu after defeating Jaquio, Irene starts to devote her life to him. Sometime after the OVA, she marries Ryu and settles for running an antique shop, while aiding him from time to time during the ''Dead or Alive'' tournaments.
* ActionGirl: Specially in the NES trilogy, albeit she also has a couple of moments in the modern era.
* ActionGirlfriend: Irene and Ryu were already an item in ''The Ancient Ship of Doom'', and she has her moments in it.
* AdaptationDyeJob: Originally a brunette in the NES trilogy and OVA, but is a blonde as of ''Dead or Alive: Dimensions'', [[spoiler:the latter of which was her hair color when she posed as her alias "Sonia" in ''Ninja Gaiden II'']].
* ArtShift: [[spoiler:The current Irene in ''Dead or Alive: Dimensions'' uses Sonia's design, but the contrast is quite different from her ''Ninja Gaiden II'' appearance. This is due to the differences in the art style used in the ''Dead or Alive'' series before the fifth installment, thus Irene had to look like most of the other girls in that game, even though Irene and Sonia should look exactly alike since they're the same person]].
* BackFromTheDead: [[spoiler:After being sacrificed in ''The Dark Sword of Chaos'', the Dragon Sword uses its power to bring Irene back]].
* BareYourMidriff: Her appearance in ''Dead or Alive: Dimensions'' and ''Razor's Edge'', which is the only daring part of her attire now. [[spoiler:Even when she was "Sonia's [[HotterAndSexier shoes]]"]], Irene remains quite modest.
* {{Chickification}}: Hit her hard in the OVA; in fact, she's not even a FauxActionGirl, but a DamselInDistress from start to finish.
* ContinuityNod: Just the fact that [[spoiler:Sonia was confirmed to be Irene's alias]] in ''Dead or Alive'' served to effectively tie the modern installments as occurring before the NES trilogy, as Itagaki in his last days at Tecmo was heavily contradicting the series' {{Continuity}}.
* DamselInDistress: At least once in each game she appears in, but goes full stop in the OVA.
* DesignatedLoveInterest: Showcased in the ending of the first NES game
-->'''Irene''' "Wait, Ryu, what is [[StandardHeroReward the payment]] you already received?"
-->'''Ryu''' "She's right in front of me."
* EightiesHair: Her hair style in the NES trilogy
* FanServicePack, HotterAndSexier: Pretty much each of Irene's measurements were "upgraded" when Team Ninja modeled her in 3D for ''Dead or Alive: Dimensions''.
** YouDontLookLikeYou: As a result of being years in the shadows, leading towards NotAsYouKnowThem; just to hit the point home, [[spoiler:Sonia in the modern ''Ninja Gaiden II''? Irene and Sonia are one and the same]].
* FauxActionGirl: Even as a CIA agent, Irene isn't the most dependable ally.
* TheGunslinger: [[spoiler:Proved herself with pistols, machine guns and bazookas in ''Ninja Gaiden II'']].
* HappilyMarried: With Ryu as of ''Dead or Alive'', but modern installments have made this as ambiguous as possible, yet stating they're still together.
* InformedAttribute: The fact Irene runs her "husband's" antique shop is only seen in a brief passage for the first ''Dead or Alive'' official guide that Tecmo released back then. This is solely supported by the [=OVA=] as Irene never truly appeared in ''Dead or Alive'' until ''Dimensions'', and we don't see her taking care of the shop in it either.
* MissionControl: For Ryu in ''Dead or Alive: Dimensions'' and Ayane in ''Razor's Edge''
* NotQuiteDead: [[spoiler:Does this as one of the few reveals in ''The Ancient Ship of Doom'']]
* ReportsOfMyDeathWereGreatlyExaggerated: In ''The Ancient Ship of Doom'', [[spoiler:Irene is supposedly killed by Ryu's doppelganger on Foster's orders. In truth, she had faked her death and was working with the U.S. Army to uncover evidence of Foster's crimes]].
* SpellMyNameWithAnS: Japanese romanization found on their official guides for the original trilogy had Irene as ''Aileen''; fansubs for the OVA also spelled her name this way.
* TenMinuteRetirement: The OVA shows Irene cutting all ties with the CIA. ''Dead or Alive: Dimensions'', however, shows she still has at least some contact with the agency.


[[folder: Jaquio]]

-> Debuting in: ''Ninja Gaiden'' (NES)

Main antagonist of the first NES game, the sorcerer Guardia de Mieux dubbed himself "[[{{Woolseyism}} Jaquio]]" (''{{s|pellMyNameWithAnS}}upposed'' [[SpellMyNameWithAnS to be]] "Jaki-Oh", as in "Devil King"). While supposedly human, Jaquio wields powerful BlackMagic, and his appearance is bizarre and uncanny - his skin is deep purple, and he wears a tattered red tunic with a hexagram embroidered on the front, with the purple skeleton of a demon draped over his body like armor. Jaquio is the chieftain of the "Chaos Tribe", and he plans to steal the Demon Statue and break the seal on the Dark God, plunging the world into darkness.
* AmazingTechnicolorPopulation: His skin is ''purple'', suggesting either extensive body paint or an origin decidedly beyond human.
* BackFromTheDead: [[spoiler:Pulls this after Ashtar is defeated in ''The Dark Sword of Chaos'']]
* BigBad: Of the first NES game
** TheDragon: Implied to have been this to Ashtar when the latter reveals himself in the second game, claiming Jaquio was merely his subordinate.
** HijackedByGanon: [[spoiler:Once Ashtar dies halfway through ''The Dark Sword of Chaos'', Jaquio reclaims his title as the BigBad]].
* CameBackWrong: During [[spoiler:the second game]], the power of [[spoiler:The Dark Sword of Chaos]] revives him after Ryu beats him, but it also warps him to a point where he's little more than a snarling beast driven by instinct and rage.
* EveryoneCallsHimBarkeep: Guardia de Mieux is his real name; Jaquio [[RedBaron is simply a title]].
* FinalBoss: Of the first NES game [[spoiler:and ''The Dark Sword of Chaos'']]
* OneWingedAngel: He takes on not just one, but ''two'' of these forms during the final battle.
* SpellMyNameWithAnS: Is it "Jaquio", "Jakio" or "Jakyo"? Who knows?


[[folder:Joe Hayabusa]]

-> Voiced by: Creator/NorioWakamoto (JP), Creator/KeoneYoung (EN)
-> Debuting in: ''Ninja Gaiden'' (NES)

Known as Jô/Joe in Japan and "Ken" in North America for the NES series, he is Ryu's father, current leader of the Dragon Ninja Clan, and previous wielder of the Dragon Sword. Much like his son, Joe is a Master Ninja and in contrast to Ryu who trains for discipline and tradition, Joe seeks to surpass his limitations. His preferred ninja attire of choice is a white shinobi shozoku (ninja uniform), although he's adorned with some armor around his body.

In the NES trilogy, Joe leaves Ryu with the Dragon Sword to engage in a duel (later revealed to be one of Jaquio's minions Bloody Malth). The outcome of the fight is not seen, but Joe winds up becoming controlled by Jaquio's magic. Ryu breaks the sorcerer's hold on his father and frees him. In the modern series, Joe constantly leaves to continue his training, as Ryu states his father is "never satisfied with the power he wields". In ''Ninja Gaiden II'', Joe fails to prevent Elizébet, Queen of the Greater Fiends, from taking the statue sealing the Archfiend Vazdah as he duels with Genshin, Overlord of the Black Spider Ninja Clan. Injured and blinded, he tasks his son to prevent the Archfiend from resurrecting.

Joe returns in ''Ninja Gaiden III'', encouraging Ryu to not allow the darkness of his heart, alongside the Grip of Murder, to conquer his very being.
* BackForTheDead: [[spoiler:Returns in the end of the first NES game, only to [[DiedInYourArmsTonight die in his son's arms]]]]
* BigDamnHeroes: [[spoiler:A minor one in the final level of ''Ninja Gaiden III'', where he and Momiji save Ryu from a bunch of chimeras he was having a hard time defeating due to the Grip of Murder]].
* BrainwashedAndCrazy: [[spoiler:Done to him by Jaquio in the first NES game as the "[[MalevolentMaskedMan Devil]]"]]
* DoomedByCanon: [[spoiler:Unless the modern trilogy doesn't end up negating future events set forth by the NES trilogy, Joe will inevitably die before the first ''Dead or Alive'' tournament]].
* DubNameChange: Ken for the NES series, but the modern trilogy rectifies this back to Joe on both sides of the Pacific.
* HandicappedBadass: In ''Ninja Gaiden III'', it's implied he was blinded by Genshin in the previous game, due to the blindfold he wears over his eyes at all times, but he's still more than capable of wielding a sword and kicking ass.
* MentorOccupationalHazard: Ryu's mentor [[spoiler:until he dies in the first NES game]]
* NotQuiteDead: [[spoiler:Turns out he survived the duel with Bloody Malth, but winds up getting BrainwashedAndCrazy]]
* SpellMyNameWithAnS: Phoenitically, it can be either "Jô" or "Joe"
* TakingTheBullet: Does this for Ryu in the first NES game before he heads to fight Jaquio; [[spoiler:it's what costs him his life]].

[[folder:Robert T. Sturgeon]]

-> Voiced by: Creator/NorioWakamoto (OVA), Zach Hanks (EN - ''Ninja Gaiden III''), Creator/BinShimada (JP - ''Ninja Gaiden III'')
-> Debuting in: Ninja Gaiden II: The Dark Sword of Chaos

Also known as "Jungle Rat" Robert, he's a United States Army Special Forces operative who aids Ryu throughout ''The Dark Sword of Chaos'', constantly revealing information about Ashtar. Although no different than a modern day commando, Robert proves himself useful to the Dragon Ninja, including being a reliable informer, following Ryu closely to the Tower of Lahja and surrounding the area with U.S. Army forces to distract Ashtar from finishing off Ryu. He proceeds to enter the Chaos World for the final battle, but Robert only goes as far against Ashtar. While it seems he dies keeping the demons from reaching Ryu, the OVA reveals he survived, having quit the army and running a private eye agency to keep track of Ryu, but offering him any assistance the {{Ninja}} might need in the future.
* ArmorPiercingSlap: Robert, a highly trained soldier, after completely raiding a building full of mutants with just his friend Jeff and later all by himself, gets slapped by Katherine shortly after he lives through it in the OVA.
* {{Badass}}: Robert proved himself in ''The Dark Sword of Chaos'' from start to finish, aiding Ryu on equal grounds, planning good barricades with the U.S. Army, including holding off demons by himself.
** BadassNormal: Naturally, Robert is a simple, yet highly-trained soldier.
* BloodFromTheMouth: After a run-in with [[spoiler:the newly-resurrected Jaquio]] in ''The Dark Sword of Chaos'', a heavily-injured Robert is seen bleeding from the corner of his mouth.
* BloodKnight: While a peaceful guy most of the time, Robert does a long speech in the OVA about how the battlefield for him is not much different than what most men desire.
* TheCameo: Appears in ''Ninja Gaiden III'' [[spoiler:as the fighter pilot transporting Ryu to rendezvous with Mizuki]].
* CoolShades: Never takes them off
* FireForgedFriends: With Ryu during ''The Dark Sword of Chaos'', with Jeff in the OVA
* MysteriousWatcher: Introduces himself as one, and has other minor moments as well.
* OneManArmy: Not to the extent of Ryu, but Robert sure knows his way within the Chaos World
* PrivateDetective: After quitting the army
* RetiredBadass: Not for a very long time, but still long enough
* SunglassesAtNight: Robert is badass enough to make them work
* WackyMarriageProposal: After killing dozens of mutants in a closed site with Jeff, adding a high chance of getting himself killed, when Robert lives through it, he proposes to Katherine seconds after in the OVA.


!!Debuting in ''Ninja Gaiden'' (Xbox)


-> Voiced by: Creator/WakanaYamazaki (JP), Creator/JaniceKawaye (EN)
-> Debuting in: ''Ninja Gaiden'' (Xbox)

A CanonImmigrant from the ''Dead or Alive'' series, Ayane made her way into ''Ninja Gaiden'' in the Xbox {{Revival}} of the series. She is a [[{{Ninja}} kunoichi]] from the "Hajin Mon" sect of the "Mugen-Tenshin Ninja Clan", an ally of the Dragon Ninja Clan. Ayane is the primary choice for the Mugen Tenshin when they need assistance from the Dragon Clan as she has built a mutual friendship with Joe and Ryu Hayabusa. Even though he's leagues above her in rank, Ayane aids him on his missions either by helping and informing from the sidelines or outright fighting alongside him.
* ActionGirl: Gets her chance to shine in ''Sigma II'' and ''Razor's Edge''
* AnimalMotifs: Butterflies, from her choice of clothes, to their color and her sash
* ArtEvolution: To coincide with her appearance in ''Dead or Alive 5'', Ayane gets this treatment for ''Ninja Gaiden III'' with smaller eyes, more realistic Asiatic facial structure and modest measurements.
* AttemptedRape: Her first mission in ''Razor's Edge'' begins with a terrorist breaking into her massage parlor while she's dressed with a towel, who proceeds to undo it. [[BullyingADragon Take three guesses]] [[TooDumbToLive at what happens next]].
** [[FridgeBrilliance Makes sense]] due to how [[ChildByRape she happened]].
* BadassAdorable: She may look cute, small and young, but she's extremely strong.
* BeautyIsNeverTarnished: Played straight in ''Sigma II'', but sharply averted in ''Razor's Edge''. Like Ryu, she is stained by her enemies' blood.
* ColourCodedForYourConvenience: Almost everything related to Ayane is purple, including her [[YouGottaHaveBlueHair hair]], clothes, aura, ninpo, explosive shurikens, etc.
** CurtainsMatchTheWindow: Purple everywhere! However...
** TechnicolorEyes: Certain cut-scenes depict them as red with shades of pink rather than purple.
* DangerouslyShortSkirt: The one she wears in ''Sigma II'' sure makes it easy to get a PantyShot.
* DeadpanSnarker: Shows this trait when Ryu is not around in ''Sigma II'' and ''Razor's Edge''
-->'''Ayane''': "No shit."
* DemotedToExtra: Ayane only appears in ''Ninja Gaiden III'' to deliver a replacement sword for Ryu after losing the Dragon Sword due to the Grip of Murder. ''Razor's Edge'' expands her role in the story, just as it happened between ''Ninja Gaiden II'' and ''Sigma II''.
* EasyModeMockery: In ''[[EnhancedRemake Ninja Gaiden Black]]'', dying continuously in the first level results in Ayane giving players the option of turning the difficulty down to "Ninja Dog". This results in her [[LeaningOnTheFourthWall telling players off for giving up at "Normal" difficulty]]; to further the mockery, she gives players ribbons to boost stats for the rest of the play-through.
-->'''Ayane''': "Master Ryu - or, should I say, [[DemotedToExtra Young Ninja Ryu Hayabusa]] - it seems I have greatly overestimated you. [[WeCannotGoOnWithoutYou Oh, well. We have no choice but to proceed]]. I will support you in every way I can. Don't be overconfident; just do what I say and perform your duties as competently as you can. You must complete your task without fail."
* EverythingsBetterWithSpinning: Being based on her fighting style from the ''Dead or Alive'' series, her moves revolve around this trope. Hell, she's even [[TropeCodifier codified]] [[Pantheon/{{Combat}} this]] for {{Spin Attack}}s.
* FanServicePack: Her ''Ninja Gaiden'' outfits are pretty concealing compared to her default attire in ''Dead or Alive''; in the sequels, she gets progressively more {{Stripperific}} and has noticeably bigger breasts.
** Note a year has passed between the two games, and since she's supposedly in the middle of adolescence...
* FragileSpeedster: Of the selectable girls in ''Sigma II'', Ayane is the fastest combatant, but is the most defensively-exposed of them.
* GameplayAndStorySegregation: InUniverse, Ayane wouldn't dare talk back to Ryu not because he's a Master Ninja and she's ranks below him, but because he's one of the few people who don't [[spoiler:brand her as a bastard child of the Mugen-Tenshin]]. However, this won't stop her from mocking him for giving up at the GameOver screen, defaulting to "Ninja Dog" difficulty and presenting him with stat-boosting ribbons.
** When Ninja Dog mode is selected, it also changes the default title screen to a picture of Ayane, the implication Ryu gets demoted to a ''true'' Ninja Dog, thereby making Ayane ''his superior'' and consequently becoming ''the main character''.
* GiantWaistRibbon: Sports one in ''Sigma II'' as a CallBack to her ''Dead or Alive'' outfits; one of them also appears in ''Razor's Edge''.
* HighlyVisibleNinja: She certainly isn't dressed for sneaking around in the shadows, but granted, that's not what she does in these games most of the time.
* {{Jerkass}}: Averted as Ayane doesn't show much of her base personality from ''Dead or Alive'' in ''Ninja Gaiden'' since she's dealing with mostly higher ranking ninjas like Ryu. Unfortunately, this won't stop her from mocking him at the GameOver screen.
** JerkWithAHeartOfGold: Ayane does treasure what friends she has and is ready to help Ryu and Dragon Ninja Clan whenever possible.
* MysteriousWatcher: Her appearance in ''Ninja Gaiden'' from start to finish
* PrettyInMink: Ayane's alternate costume in ''Sigma II'' has a white fur neck wrap and gloves trimmed with white fur.
* ScarfOfAsskicking: In ''Razor's Edge'', which resemble a couple of butterfly wings in its ends.
* StockNinjaWeaponry: Kunai for long-distance weapons and [[DualWielding a pair]] of ninjato for close-quarters combat
* YoungerThanTheyLook: Mind you, Ayane doesn't look her age even in her home series (she's 16 in ''Dead or Alive''). In ''Ninja Gaiden'' she's 14 years old, then a year older in ''Sigma II''.



-> Voiced by: Creator/KojiTotani (JP), Charles Dennis (EN)
-> Debuting in: ''Ninja Gaiden'' (Xbox)
One of the three Greater Fiends of the "Holy Vigoor Empire", Doku is encased in a [[TinTyrant heavy, dark suit of armor]], closely resembling an ancient {{Samurai}}. He single-handedly destroyed the Hayabusa Village, killing many of the Dragon Clan Ninjas and stole the Dark Dragon Blade. Doku's goal is to aid his master, the "Dark God Vigoor", into converting capable people into Fiends and conquering the world. Doku is Ryu's motivation to invade Vigoor, as he also killed his childhood friend Kureha. Although Ryu manages to find and defeat him, Doku's last resort is an attempt to transform the {{Ninja}} into a Fiend, but the transformation is only partial as Doku's disembodied spirit fades away.

Doku returns in ''Ninja Gaiden: Dragon Sword'' as a malevolent spirit haunting the ruins of Tairon, capital city of Vigoor.
* BackFromTheDead: Although Ryu destroys his initial body, Doku returns in a spirit form for a final showdown. How he manages to show up in ''Dragon Sword'' isn't answered.
* {{BFS}}: Kitetsu
* BlackKnight: Bonus points for Doku as the black armor is his actual body.
* TheDragon: Answers directly to Marbus, who answers to Vigoor.
* TheFaceless: Since Doku doesn't have a proper body to begin with, he has no face to portray himself. Instead, he wears a mask as part of his armor.
* HopelessBossFight: It's impossible to defeat him in the first fight in ''Sigma'', unless you're an insanely skilled player. Even if you do, Ryu will still die after the fight, regardless.
* InstantWinCondition: Doku has a difficult to dodge grapple attack exclusive to the first fight in ''Sigma'' that instantly ends the battle.
* LightningBruiser: While very heavy, Doku's capable of pulling off some fast-paced combos and slashes.
* ObviouslyEvil: As if his introduction cutscene wasn't enough, Doku reeks of evil from head to toe.
* RecurringBoss: Three times in the same game
* TakingYouWithMe: In his final moments, Doku curses Ryu in an attempt to convert him into a Fiend and serve Vigoor.



-> Voiced by: Creator/HisaoEgawa (JP), Creator/RobinAtkinDownes (EN)
-> Debuting in: ''Ninja Gaiden'' (Xbox)

A man delivering orders to the Vigoorian forces in the capital city of Tairon, Gamov is a [[LennonSpecs bespectacled]], green hat and trench coat-wearing spy, [[MysteriousWatcher who constantly trails Ryu through the Holy Vigoor Empire]], proving himself very agile and quick in the trigger. While facing Rachel, he was supposedly working together with Doku for the Dark God Vigoor, but in reality, Gamov served the "Dark Disciple", informing his master on the growing power of the Dark Dragon Blade.
* AllThereInTheManual: [[spoiler:That Gamov hails from the Black Spider Ninja Clan and was Genshin's younger brother is not mentioned in the main story of the modern ''Ninja Gaiden''. Players must find Genshin's diary in ''Ninja Gaiden II'' and read the entry about his dead younger brother to form the connection]].
* BadassInANiceSuit: Gamov certainly doesn't look like [[spoiler:he came from a ninja clan]], considering the way he dresses and all.
* TheDragon: For the Dark Disciple
* GunsAkimbo, TheGunslinger: Packs two pistols in the fight against Rachel in ''Sigma''
* TheMole: Serves the Dark Disciple instead of the Vigoor Empire; [[spoiler:considering he was part of the Black Spider Ninja Clan, who were seeking the Dark Dragon Blade as well, it's implied he was planning on betraying the Dark Disciple as well]].
* OffWithHisHead, YouHaveOutlivedYourUsefulness: [[spoiler:Once the Dark Disciple acquires the Dark Dragon Blade, he shows his "gratitude" to Gamov by killing him with the weapon]].



-> Voiced by: Jun Shikano (JP)
-> Debuting in: ''Ninja Gaiden'' (Xbox)

The "Dragon Shrine Maiden" of the Dragon Ninja Clan, sworn to protect the sacred "Eye of the Dragon" treasure, she is Momiji's older sister and Ryu's childhood friend. Kureha is part of the "Dragon Lineage" that is destined to play a part in keeping the clan's tradition. Being inseperable from Ryu since childhood, she also wanted to be of importance: while he grew up to be a Master Ninja, she grew up to be a shrine maiden. As guardian of the "Dragon Lineage Shrine", she was charged with the protection of the Eye of the Dragon, and Kureha fufilled her task to death when Doku killed her in an attempt to steal the Eye of the Dragon. It was for her that Ryu goes on a quest for vengeance towards Doku and the Holy Vigoor Empire.

Kureha briefly returns as an spirit in ''Dragon Sword'', aiding Ryu and Momiji against the Dark Dragon.
* AdvertisedExtra: She has a full character profile in the manual that treats her like a major character. [[WeHardlyKnewYe She appears in precisely one cut-scene]] where she doesn't even get a line of dialogue in before getting KilledOffForReal.
* ChildhoodFriends: With Ryu
* DeathByOriginStory: Kureha's early death in the Xbox ''Ninja Gaiden'' triggers Ryu into a long, vengeful mission.
* DisposableWoman: Originally, Kureha only existed to motivate Ryu with her cruel death, even though she would serve as a PlotPoint in ''Dragon Sword''. One can wonder why she has a voice actor credited in the Xbox game since not a single word is heard from her.
* MacGuffinGuardian: Zigzagged - subverted since she's KilledOffForReal at the onset of ''Ninja Gaiden'', but played straight in ''Dragon Sword'' at the climax of the game. In the battle against the Dark Dragon, Kureha's spirit releases the Eye of the Dragon from Momiji's soul, which is required to form the True Dragon Sword in order to defeat the beast.
* {{Miko}}: For the Dragon Ninja Clan, as being part of the Dragon Lineage is a requirement to be the village's shrine maiden, Kureha was fated to be one since childhood.
* NonDubbedGrunts: In the Japanese track for ''Ninja Gaiden'', Kureha has a weak death cry in her final moments, while there is none in the English track. This explains why there's no credited voice actress in the localization. Jun Shikano reprises her role of "grunts" in ''Dragon Sword'', which fits right at home, as the characters in the game are portrayed in ''VideoGame/TheLegendOfZelda'' grunts-only style.
* PassingTheTorch: Kureha, as a spirit, hopes that Momiji will take on her sister's duty as a shrine maiden.
* PosthumousCharacter: Kureha's background is explored in ''Dragon Sword''.
* {{Retcon}}: The Eye of the Dragon was a circular, generic pendant in ''Ninja Gaiden'', but becomes a green ''magatama'' in ''Dragon Sword'', only for the color to change into purple in ''Ninja Gaiden II'', the latter of which is now permanent.



-> Voiced by: Creator/YukitoshiHori (JP), Creator/FredTatasciore (EN - ''NGSII'')
-> Debuting in: ''Ninja Gaiden'' (Xbox)
The "Ruler of Hell" and one of the five Greater Fiend Lords of Vigoor in the first Xbox game, Marbus guards the "Holy Vigoor Emperor", the mastermind behind the theft of the Dark Dragon Blade. In contrast to other Greater Fiends, Marbus has legions of lesser Fiends as his direct followers, often leaving the dirty work for them, and only acting himself when he sees fit or worthy of his time. Ryu happened to be one of the latter as Marbus was forced to take him on directly. The result was the Greater Fiend losing and targeting Ryu for his personal {{Revenge}} in the future.

Marbus returns in ''Sigma II'' looking for Ryu in New York City, yet he finds Rachel instead and is defeated once again.
* ArtEvolution: Marbus' design changed quite a bit when he returns back in ''Sigma II''.
* AscendedExtra: Marbus in ''Sigma II'' as a boss character, with a more demonic-looking appearance and motivations stemming from revenge.
* CoolChair: Sits on one in ''Ninja Gaiden'' as he sends waves upon waves of fiends against Ryu
* TheDragon: To Vigoor
** DragonWithAnAgenda: That said, Marbus doesn't seem concerned about his master being dead when he comes back in ''Sigma II''. In fact, he's less concerned about his realm and more about [[ItsAllAboutMe being defeated]] [[ItsPersonal by Ryu]].
* FlatCharacter: For someone who is said to be Doku's superior, Marbus has less exposition. Ironically, he gets more of it in his small role for ''Sigma II''.
* FlunkyBoss: The only boss to be this at normal difficulty in the first game. In a twist of this trope, Marbus' flunkies includes ''previous bosses''; at higher difficulties, he hides behind Ishtaros and Nicchae, who are harder than he is.
* MeaningfulName: Named after the same-named "President of Hell" from ''[[Literature/TheDivineComedy Dante's Inferno]]'', who rules over 36 legions of demons, just as Marbus controls many Fiends for himself.
* NotQuiteDead: Ryu didn't kill Marbus; apparently, all the {{Ninja}} did was [[ScarsAreForever scar him]] and cleave off one of his horns, evidenced by his new appearance in ''Sigma II''
* SlouchOfVillainy: Marbus does a good impression while he waits for Ryu to face off against his minions in the first game.



-> Voiced by: Creator/BanjoGinga (JP), Neil Ross (EN)
-> Debuting in: Ninja Gaiden (Xbox)
The leader of the "Shadow Clan Ninja" and Ryu's maternal uncle, Murai is a former member of the Dragon Ninja Clan who went rogue and [[StartMyOwn formed his own ninja clan]], while prefering to stay away from the Dragon Ninja Clan's affairs. Murai still wanted to keep a good relationship with the Hayabusa Clan, thus aids his nephew by opening the Shadow Clan Fortress for Ryu's training routine. Murai is open about his extreme philosophy of the ever-increasing need for power a true {{Ninja}} must possess, no matter the cost, so he tries to push some of it to Ryu by trying to make him accept the Dark Dragon Blade.
* {{BFS}}: [[spoiler:The Dark Dragon Blade]]
* EvilMakesYouMonstrous: [[spoiler:With the Dark Dragon Blade in his hands, the evil energies emanating from the blade turns Murai's body demonic]].
* EvilUncle: [[spoiler:Is the true BigBad of the Xbox ''Ninja Gaiden''; whether he was EvilAllAlong is never known, though the implication of going rogue and forming a ninja clan is all the more telling that it might be true]].
* FightingWithChucks: Murai's skills with the nunchakus are to be praised, since Ryu's use of the weapon is incomparable to his uncle, both in power and speed.
* LargeAndInCharge: From what little we get to see of Murai, he appears the tallest and most muscular of the bunch; naturally, he ''is'' in charge of his own clan.
* LightningBruiser: Faster and more powerful than the Shadow Ninja {{Mook}}s; though slower, he's still quite capable of some nasty rushdowns.
* TheManBehindTheMan: [[spoiler:As the Dark Disciple, Murai was behind everything - he divulged the presence of the Dark Dragon Blade to Vigoor, who ordered Doku to raze the Hayabusa Village and retrieve it]].
* ManipulativeBastard: [[spoiler:Ryu's RoaringRampageOfRevenge merely allowed the Dark Dragon Blade to grow more powerful; Murai let the weapon switch from hand-to-hand intentionally to feed its evil power before he got his own hands on it after Vigoor is destroyed]].
* WakeUpCallBoss: If the modern ''Ninja Gaiden'' didn't clue players in as to it being just as hard as the NES trilogy, Murai will show why that's the case. Being able to beat him means players are capable of beating the game.
* WalkingSpoiler: All the events in ''Ninja Gaiden'' are tied directly to him



-> Voiced by: Creator/TakeshiAono (JP), Creator/MichaelBell (EN, ''Ninja Gaiden''), Creator/PaulEiding ((EN - ''Ninja Gaiden II'', ''Ninja Gaiden III'')
-> Debuting in: ''Ninja Gaiden'' (Xbox)

The legendary weaponsmith and shop owner who aids Ryu on his journeys, Muramasa is a mysterious merchant who seems to have traveled across the entire Earth, with a swath of knowledge regarding antiques, relics and weapons alike. Despite his frail, old appearance, Muramasa seems to know a few tricks regarding the sword, as demonstrated in ''Sigma II''.
* AdamSmithHatesYourGuts: The price of weapon upgrades increases with weapon levels, so thousands of yellow essence will be spent upgrading them. In particular, the Wooden Sword will make some players focus solely on it, leaving other weapons behind in reaching their maximum.
** Inverted in ''Sigma II'' where weapon upgrades are free (though only one upgrade per weapon at a time) and bringing him "Crystal Skulls" grants a permanent 50% discount for recovery items.
* BackStab: Muramasa sneaks behind one unsuspecting Black Spider Ninja in ''Sigma II'' at the end of Momiji's level and backstabs him with a mantis sword.
* BadassGrandpa: Muramasa still does some impressive things even in his advanced age, and shows some skill with a sword.
* TheBlacksmith: Muramasa personally upgrades all of Ryu's weapons if given enough yellow essence.
** UltimateBlacksmith: That said, only Muramasa can handle all these legendary or downright demonic weapons Ryu possesses.
* CanonImmigrant: Muramasa appears in ''Dead or Alive 4'' as an operator of a small vegetable cart after Hitomi and Lei-Fang fight over a cabbage. He also appears in ''Dead or Alive 5'', [[spoiler:having apparently helped Kasumi while she was in hiding]].
* CoolOldGuy: Muramasa is said to be above 100 years old, and he still is a fairly modern guy, funny even.
* ExpositionFairy: Muramasa often lets out some {{Plot Point}}s that Ryu needs to advance in his journey.
* MrExposition: In his introduction scenes, Muramasa lets out directions about a place Ryu needs to go or about the situation the {{Ninja}} currently finds himself in.
* NonDubbedGrunts: Most of Muramasa's average grunts for an elder aren't dubbed - they're straight from the Japanese track, unlike other characters who got their grunts dubbed.
* RetiredBadass: Muramasa, the doddering old shopkeeper, makes carving up ninjas look effortless. This makes it hilarious when he states his old legs won't allow him to go at the top of Mount Fuji in ''Ninja Gaiden II'', which becomes dubious since he apparently managed to build [[DungeonShop statues of himself in the Underworld]]...
* TooLongDidntDub: Muramasa's greetings aren't dubbed in ''Ninja Gaiden II'' and ''Sigma II'', but says ''Irasshai!'' instead of ''Welcome!'' to Ryu when his shop is accessed.
* WalkingTheEarth: Prior to the games, it is said that Muramasa personally erected all of his statues Ryu finds in his journey, including ones in ''the Underworld''.
* WallOfWeapons: Can be seen in Muramasa's shop in the Xbox ''Ninja Gaiden''



-> Voiced by: Creator/MichieTomizawa (JP), TaraStrong (EN)
-> Debuting in: ''Ninja Gaiden'' (Xbox)

The heroine of the modern ''Ninja Gaiden'' and Fiend hunter from the Holy Vigoor Empire, Rachel and her sister Alma are afflicted with a blood curse that turns humans into Fiends. By the events of the game, Alma has already succumbed to the curse and turned into a complete Fiend. Rachel still maintains her human form and becomes a Fiend hunter; believing her sister has no more chance to revert back, Rachel sets on a journey to put Alma out of her misery. Rachel gets caught up in Doku's plot to bait Ryu, as the Greater Fiend also has Alma under his control. Rachel pursued him only to get captured herself; Ryu manages to rescue her and in return she saves him in time after his destroys the Holy Vigoor Emperor.

Rachel returns in ''Sigma II'' during a Fiend hunt in New York city, and is looking foward to reuniting with Ryu again.
* ActionGirl: While playable in ''Sigma'', she becomes a full-fledged one in ''Sigma II'' with her own dedicated level.
* AnimalMotifs: Snakes - her health bar in ''Sigma'' is shaped like one and her sorcery in ''Sigma II'' is called "[[{{Ouroboros}} Ouruborus]]", the thematic symbol of a snake eating its own tail.
* BigDamnHeroes: Rachel helps Ryu escape the Underworld of what seemed like certain death for him
* BoobsOfSteel: Rachel's physical strength is proportional to the size of her bust; she can even handle heavy weaponry better than him at first in ''Sigma''.
* CanonImmigrant: Makes her ''Dead or Alive'' appearance in the UpdatedRerelease of ''Dead or Alive 5''.
* ChuckCunninghamSyndrome: Despite being re-included in ''Sigma II'', Rachel is dropped off the face of the Earth in ''Ninja Gaiden III''. While almost ''all characters'' from the series (old trilogy to modern era) get a nod, Rachel does not get a mention, not even in ''Razor's Edge''.
* DistressedDamsel: After Doku captures her, Rachel spends the rest of the story like this.
* {{Dogged Nice G|uy}}irl: A RareFemaleExample - Rachel appears to have taken quite a liking to Ryu, but he promptly seems to refuse, and going by the series' {{Continuity}}, [[HopelessSuitor this isn't remotely going anywhere with him]].
* DropTheHammer: Zigzagged - the "War Hammer" in the first game looks more like an [[AnAxToGrind axe]], while the "Inferno Hammer" in ''Sigma II'' does resemble an actual hammer this time around
* FauxActionGirl: In the original Xbox game, Rachel wasn't playable, thus in story segments she falls straight into this.
* GatlingGood: Rachel sports a "Gatling Gun" as her projectile weapon in ''Sigma II''.
** [[SwordAndGun Hammer And Gun]]: Her movelist has some oddities which consists of melee attacks quickly followed by a gun salvo.
* InformedAbility: The guidebook states she has the ability to sense when Fiends are nearby, but this has no affect on gameplay whatsoever.
* InformedAttractiveness: Before her first encounter with Ryu, there is a dead Black Spider Ninja's diary referring to a woman who fights Fiends and is very beautiful, despite her ferocity in battle. We never find out if Ryu agrees with this assessment upon reading the entry.
* KillTheOnesYouLove: Rachel has reached this conclusion with Alma, and doesn't believe there's another way to save her sister anymore.
* MightyGlacier: As strong as she is, she lacks Ryu's speed and agility. This is carried over into ''Sigma II'' between her, [[FragileSpeedster Ayane]] and [[JackOfAllStats Momiji]].
* PowerCrystal: Rachel's crystal earrings are magically enhanced
* SomethingAboutARose: Rachel's sorcery in ''Sigma II'' is rose-themed and petals flown around it
* {{Stripperiffic}}: Rachel's choice of clothes for Fiend hunting are unique to say the least.
* [[VariableLengthChain Variable Length Grappling Hook]]: Seriously, how ''long'' can the rope to her grappling hook get, and how does she manage to reel it back into that tiny arm device? In the CollapsingLair of the finale in ''Ninja Gaiden'', she doesn't even seem to be grappled to anything, nor do the cut-scenes show the end of the rope - it's as if she's simply suspended in mid-air.
* WaifFu: Rachel is very strong despite her slender figure due to her cursed Fiend blood, yet she can best enemies many times her size and obviously more muscular than her.



-> Debuting in: ''Ninja Gaiden'' (Xbox)

Known to the Holy Vigoor Empire as the Holy Vigoor Emperor, this is his human form to his god form, the original "Evil Deity" who spawned the Fiends. To the commoners of the Holy Vigoor Empire, Vigoor is worshiped as a "Supreme Holy Deity", leader of their "Holy Vigoorian Order" and the absolute authority in their lives. After his defeat, a plan is set into motion in ''Ninja Gaiden: Dragon Sword'' to ressurect him by the ancient Fiends Ishtaros and Nicchea using the Dark Dragonstones to do so.
* AttackOfThe50FootWhatever: The first fight against his angelic form.
* BackForTheDead: Comes back in ''Dragon Sword'', only to die shortly after.
* BigBad: Of the Xbox ''Ninja Gaiden'' [[spoiler:until Murai is revealed to be the ''true'' BigBad of the game]].
* ClippedWingAngel: His decayed "Chaos Devil" form
* {{Expy}}: Of Mundus from ''Franchise/DevilMayCry''
* FlatCharacter: The patron saint and deity of the Vigoor Empire doesn't have a single line, passage or mention of his personality - it's just a boss fight players must pass in order to finish the game.
* FloatingLimbs
* LightIsNotGood: His stone angel form
* PhysicalGod: Introduced as such, [[{{Retcon}} but changed later, as he is not the only one]].
* {{Retcon}}: In the first Xbox game, Vigoor is also referred to as the ''Dark God Vigoor''; aside from his Holy Vigoor Emperor title, this implies he is ''the'' Archfiend, a PhysicalGod beyond all other Archfiends. ''Ninja Gaiden II'' changes his epitaph to "Supreme Archfiend Vigoor" in diary entries found throughout the game, which BigBad Vazdah also has, thus Vigoor is but one Archfiend from a ''possible group'' rather than the ''the only''.
** [[spoiler:Given the diary entries in the same game notes Vazdah is essentially [[[MonsterProgenitor Vigoor's son]], this might not be the case]].
* {{Satan}}: Zigzagged - the first Xbox game and ''Dragon Sword'' certainly plays Vigoor up as this, but ''Ninja Gaiden II'' possibly {{Retcon}}ned him into a powerful devil, but not THE devil.

!!Debuting in ''Ninja Gaiden: Dragon Sword'' ([=NDS=])


-> Voiced by: Creator/YukoMinaguchi (JP), Creator/KateHiggins (EN), Creator/ShinoKakinuma (JP - ''Yaiba: Ninja Gaiden Z'')
-> Debuting in: ''Ninja Gaiden: Dragon Sword''

The last Dragon Shrine Maiden, Kureha's younger sister and Ryu's apprentice, Momiji eventually replaces her sister's position as the distinguished Dragon Lineage shrine maiden following Doku's invasion of the Hayabusa Village. Having been in another village to run an errand, Momiji was spared the same fate as Kureha; hearing about her sister's death, Momiji felt powerless and made a vow to become much stronger in her name, taking on the task of protecting the clan's treasure, the Eye of the Dragon. With Momiji's new resolve, Ryu takes her under his direct tutoring, making Momiji his official apprentice. In the events of ''Dragon Sword'', Momiji is captured by the Black Spider Ninja Clan, on orders from the ancient Fiend Nicchae, to retrieve the Eye of the Dragon. After Ryu rescues her and defeats the Dark Dragon, Momiji heads back to her training.

Momiji returns in ''Sigma II'', having become stronger and more than capable of fighting on her own without her mentor's assistance, while her duties as the Dragon Shrine Maiden are put in the forefront by ''Ninja Gaiden III''.
* ActionGirl: Gets to be one for a bit in "Way of The Kunoichi" mode for ''Dragon Sword'' but becomes a full-fledged one from ''Sigma II'' onwards.
* TheApprentice: Of Ryu's, specifically demonstrated in ''Dragon Sword''
* AsianRuneChant: Utters one in ''Ninja Gaiden III'' in the cut-scene preceding the Obaba boss fight to conjure up a barrier.
* BadassPreacher: Another RareFemaleExample of the Eastern variety - traditional {{Miko}}s don't fight, much less be a {{Ninja}}, but Momiji excels in both fronts.
* BackToBackBadasses[=/=]StudentAndMasterTeam: For an entire chapter in ''Ninja Gaiden III'', Momiji fights alongside Ryu, proving her actions in ''Sigma II'' weren't a matter of luck.
* BladeOnAStick: Her "Heavenly Dragon Naginata"[[note]]A Japanese spear, initially one of the few weapons women were allowed to use in feudal Japan[[/note]], another weapon common for popular portrayals of shrine maidens.
** NaginatasAreFeminine: Provides the current trope page image
* BoobsOfSteel: Not quite to Rachel's extent, but she's well-endowed ''and'' kicks plenty of ass.
* CanonImmigrant: Like Rachel, Momiji finally appears in the UpdatedRerelease of ''Dead or Alive 5'', including the Creator/{{Nintendo}} UsefulNotes/WiiU UpdatedRerelease of ''[[WarriorsOrochi Warriors Orochi 3]]''.
* CoolBigSis: Shown as this to the children of the Hayabusa Village
* DoubleJump: Her most unique skill - she's the only playable character in the modern ''Ninja Gaiden'' games who can do this, opening up more combat possibilities. Although she's a "Technique"-based character in the ''Warriors Orochi'' {{Crossover}}, she can't do this there.
* FauxActionGirl: Despite her best efforts, Momiji gets kidnapped at the start of ''Dragon Sword'' easily. Fortunately, it doesn't take long for her to [[TookALevelInBadass avert this]] and become perfectly capable of defending herself by ''Sigma II''.
* FriendToAllChildren: Case in point, her chapter in ''Sigma II'' is to rescue the kidnapped ninja-in-training Sanji from a pair of Tengu Brothers, personally pursuing them all the way to Tokyo to save him.
* HairDecorations: Always wears a white hair clip on the right side of her head
* [[{{Ninja}} Kunoichi]]: One in-training during ''Dragon Sword'', but ascends into this by ''Sigma II''
* JackOfAllStats: In ''Sigma II'', she is this for the girls - Ayane is [[FragileSpeedster fast, but weak]] and Rachel is [[MightyGlacier the opposite]], but Momiji is the most balanced between the two.
* LadyOfWar: Beautiful and feminine, yet strong and deadly
* [[LastOfHisKind Last of Her Kind]]: After Kureha's death, Momiji [[SomeoneHasToDoit is the only person worthy]] of guarding the Eye of The Dragon, given like Kureha, she too is descended from the Dragon Lineage.
* MacGuffinGuardian: Zigzagged - played straight when Momiji hid the Eye of the Dragon some time before ''Dragon Sword'' by fusing it into her soul, until it was released near the end of the game so Ryu can destroy the Dark Dragon with the True Dragon Sword. Subverted in ''Sigma II'' when Obaba mysteriously acquires it, until Ayane retrieves it to hand it personally to Ryu, but played straight again in ''Ninja Gaiden III'' where Momiji keeps the Eye with her at all times until she hands it to Ryu to use the True Dragon Sword again.
* TheMedic: She uses her powers and the Eye of the Dragon to soothe the pain in Ryu's cursed arm in ''Ninja Gaiden III'' when he returns to the Hayabusa Village.
** CombatMedic: Will perform this in the middle of the stage where she accompanies him, albeit briefly.
* {{Miko}}: Even her default costume mirrors that of the archetype, but is done in a way that it compliments her dual-role of a kunoichi. However, Momiji does appear in the traditional white ''haori'' (kimono jacket) and red ''hakama'' (trousers) in ''Ninja Gaiden III'' when Ryu returns to the Hayabusa Village.
* MyGreatestFailure: Momiji blames herself for Kureha's death to some extent, as she wasn't in the Hayabusa Village when Doku was razing it to the ground.
* RapunzelHair: Done up in a TomboyishPonytail, with her hair reaching her waist.
* SideBoob: Her default outfit starting with ''Sigma II'' sports this. Hilariously pointed out in a "[[ Top Ten Side Boobs In Games]]" article.
* ThrowTheDogABone: After some [[DeadLittleSister dead older sister]] and self-depreciation, Momiji gets to impress the clan's Master Ninja to train her personally due to her determination in getting stronger for Kureha and to protect their sacred treasure - the results are shown in ''Sigma II'' and beyond.
* TookALevelInBadass: Her growth between ''Dragon Sword'' and ''Sigma II'' is quite impressive, such that in ''Ninja Gaiden III'', Ryu {{Lampshades}} and recognizes how strong his pupil has become in his absence.



-> Voiced by: Creator/HirokoEmori (JP), Creator/KateHiggins (EN)
-> Debuting in: ''Ninja Gaiden: Dragon Sword''


[[folder:Dark Dragon]]


!!Debuting in ''Ninja Gaiden II'' (Xbox360[=/=][=PS3=][=/=][=PSVita=])


-> Voiced by: Creator/HiromiTsuru (JP), GreyDeLisle (EN)
-> Debuting in: ''Ninja Gaiden II''

The "Ruler of Blood" and "Queen of the Greater Fiends", Elizébet is the most active villain during ''Ninja Gaiden II'', one of Archfiend Vazdah's Four Greater Fiends, and the blood priestess of the Fiend cult, the "Order of the Necromantale". Elizébet is tasked with retrieving the "Demon Statue", an important ancient artifact guarded by the Hayabusa Ninja Clan. Approaching the Black Spider Ninja Clan for help, she promised Overlord Genshin and his followers Fiend powers to overthrow the Dragon Ninja Clan. Elizébet manages to trigger Ryu's anger by capturing Sonia and spitting on Genshin's pride after she resurrects him as a complete Fiend. Of the Greater Fiends, she has earned Ryu's hatred of their kind for corrupting the Black Spider Ninja Clan.
* AristocratsAreEvil: One of few Greater Fiends who is actually a noble; naturally, Elizébet is one of the most evil among them.
* BarbieDollAnatomy: While she's clearly nude in one cut-scene covered in nothing but [[{{Squick}} blood]], Elizabét's character model appears to have this going on.
* BeautyIsNeverTarnished: Zigzagged - although her Greater Fiend form is nowhere as demonic-looking as the other three Greater Fiends in ''Ninja Gaiden II'', her abdomen splits apart, showing off internal organs.
* BewareMyStingerTail: Will occasionally use this as part of her attacks
* BloodBath: Elizébet cetainly enjoys her job as the blood priestess of the Fiend cult, considering her name's a ShoutOut to [[TropeMaker Elizabeth Bathory]].
* BloodyMurder: One of her more vicious long-ranged attacks involves launching multiple blood-coated spears at Ryu; if it connects, it also [[LifeDrain refills her]] {{Hit Point}}s.
* {{Fanservice}}: The cut-scene preceding the first boss against her is this
* FemmeFatale: Implied as Elizébet's the only Greater Fiend who bothers assuming a human form
* GodSaveUsFromTheQueen: Queen of the Greater Fiends, and arguably the cruelest of the four
* HornyDevils: Both Elizébet's human and Fiend forms have suggestive overtones
* ImpossiblyLowNeckline: Justified; that bustier in her human form is likely part of her body as opposed to being actual clothing.
* InformedAbility: Despite her title as Queen of the Greater Fiends, Elizébet is never shown commanding her followers, at least, not as much as Marbus and Vigoor.
* KickTheDog: Literally kicks Genshin in the head after Ryu defeats him, [[SpeakIllOfTheDead spitting on the fallen warrior's pride]].
* MeaningfulName: Elizébet's personality and blood motif are reminiscent of the rumors surrounding the RealLife Elizabeth Bathory.
* {{Manipulative B|astard}}itch: Sought the aid of the Black Spider Ninja Clan to help her steal the Demon Statue from the Dragon Ninja Clan, promising them demonic powers in return. While she does hold up her end of the bargain, transforming Genshin and his followers into Fiends, Elizébet nevertheless saw the Black Spider Ninjas as disposable tools, fully expecting them to fall before Ryu's blade.
* OneWingedAngel: She may be the only Greater Fiend who bothers with a human form, she still transforms into her true demonic visage to battle Ryu.
* ThePowerOfBlood: Elizébet weaponizes it for several of her attacks
* TheSmurfettePrinciple: The only woman among Vazdah's Four Greater Fiends and the only relevant female Greater Fiend in the whole series.
* {{Stripperiffic}}: {{Averted|Trope}} [[BadassLongcoat in her human form]] until her boss encounter, where she strips down for an arcane ritual. In her Fiend form, she continues to expose a great deal of skin...[[BodyHorror along with her rib cage and spine]].
* WingedHumanoid: In her case, crimson butterfly wings



-> Voiced by: Creator/HikaruMidorikawa (JP), Creator/RobinAtkinDownes (EN)
-> Debuting in: ''Ninja Gaiden II''

The "Ruler of Lightning" and one of the Four Greater Fiends, Alexei awoke from his centuries-long slumber by Elizébet via the power of the Demon Statue, quickly making a bid to conquer New York City, holding court from atop the Statue of Liberty. Despite his haughty demeanor and belief in human inferiority, he is bested in a duel with Ryu. However, he later shows up in the "Realm of the Fiends" as the ritual to resurrect the Archfiend Vazdah reaches its crescendo, having recovered from his wounds and kidnapped Sonia. The two clash for a second time, and Ryu succeeds in slaying the arrogant demonic noble for good.
* AmazingTechnicolorPopulation: His skin is an ashen, pale blue
* AristocratsAreEvil: He's much more elegant and refined than most Fiends, but is no less villainous.
* BattleInTheRain: His first battle with Ryu takes place amidst a thunderstorm he conjured
* DisneyVillainDeath: At the climax of their first fight, Ryu sends him plummeting from the top of the Statue of Liberty.
* FauxAffablyEvil: He speaks to Sonia with condescending politeness when he holds her captive, but it's clear he views her as a mere pet.
* HandsomeLech: A subtle example - when he kidnaps Sonia near the end of the game, he goes as far as [[GoGoEnslavement dressing her up in an ensemble]] {{Stripperiffic}} clothes, [[IHaveYouNowMyPretty locks her in a gilded cage, and calling her "his captive bird"]]. Earlier, he displays hints of affection [[CargoShip towards the Statue of Liberty]], but this might have been his sense of theatrics at play more than anything.
* ShockAndAwe: Calls forth high-voltage attacks in battle
* ThisCannotBe: His reaction to losing to Ryu
* WakeupCallBoss: While previous bosses had predictable attack patterns (including Genshin) or were large and cumbersome, Alexei is the first to avert both characteristics. Given he's the first of the Four Greater Fiends fought in the game, he proves why this enemy type isn't a pushover, to wit a SpinAttack he uses is not only hard to evade, but unblockable. Finally, he's the first boss in the game to enter a SuperMode after his {{Hit Point}}s reach a low threshold, where all his strikes now deal extra damage.
* WalkingShirtlessScene: Worth noting as he seems to wear armored greaves, but remains bare-chested as his fellow Greater Fiends.
* WhiteHairBlackHeart: Those flowing white locks don't make him any less evil.
* WingedHumanoid: Unlike Zedonius, his wings are almost angelic
* YellowLightningBlueLightning: Blue



-> Voiced by: Creator/DaisukeGori (JP), Creator/DaranNorris (EN)
-> Debuting in: ''Ninja Gaiden II''

The "Ruler of Storms" and one of the Four eater Fiends, Volf is a vicious, four-armed werewolf and the leader of the Beast-Men tribe of Fiends. When the Greater Fiends were released, he and his Lycanthropic underlings conquered the tranquil and beautiful Aqua Capital. For all of his savagery, Volf is also a proud warrior who seeks a worthy opponent.
* BadBoss: Kills several of his own werewolf minions in his introductory cut-scene out of sheer ''boredom''...
** BenevolentBoss: ...then promises the survivors they can have the castle of the Aqua Capital as a prize if they bring him a WorthyOpponent.
* BarbarianLonghair: His wild mane gives him this look.
* BloodKnight: He revels in the chance to fight [[OneManArmy Ryu Hayabusa]].
* DuelBoss: Unlike his fellow Greater Fiends, Volf has an army present when he faces Ryu. However, he insists they remain out of the fight, determined to face the Dragon Ninja alone.
** FlunkyBoss: A posthumous example - once Volf is defeated, the rest of the Lycanthropes come bounding into the arena to avenge him. Volf plays this straight when Ryu encounters him in the Fiend Realm, however, leading a pack of centaur-esque Fiends into battle.
* MultiArmedAndDangerous: Essentially a werewolf version of [[Franchise/MortalKombat Goro]]
* OurWerewolvesAreDifferent: More specifically, Volf has four arms, [[TattooedCrook tattoos]], and a long white mane. On top of that, he wields a huge scythe, and can talk perfectly fine.
* SinisterScythe: His WeaponOfChoice is the Eclipse Scythe, an ancestral weapon handed down from one Beast Lord to the next. [[AllThereInTheManual After the old leader is slain by his successor, his body is thrown into a vat of metal, which is then made into Damascus steel, quenched in the blood of human slaves for weeks]]. Since Ryu steals the Eclipse Scythe after defeating him the first time, Volf replaces it with another one made of bone for their second encounter.
* VictoryIsBoring: He and his Lycanthropes conquer the Aqua Capital with barely any effort; he's not happy about that.
* WorthyOpponent: Comes to view Ryu as such and challenges him to a proper duel in a coliseum.



-> Voiced by: Creator/HidekatsuShibata (JP), Creator/SteveBlum (EN)
-> Debuting in: ''Ninja Gaiden II''

The "Ruler of Flames" and one of the Four Greater Fiends, Zedonius is most demonic of the four in appearance, resembling a monstrous devil with pitch-black skin and bat-like wings. He has a low opinion of humanity, considering them little better than primates, and claims to have bestowed fire upon them centuries ago (without which, he insists, they would have been nothing). Upon his release, he lays siege to a Russia-esque city in Northern Europe and eradicates their military, demanding that they "[[KneelBeforeZod submit or die]]".
* BeenThereShapedHistory: It's subtly implied he was the one who gave fire to humanity, though Ryu doesn't believe him.
* BigRedDevil: Subverted - Zedonius has the look down to a T except his skin is coal-black rather than red.
* BullyingADragon: Mocks and insults Ryu, a ninja who's already succeeded in defeating Alexei and Volf by this point.
* DeathByIrony: After Ryu bests him in a clock tower, he's consumed by his own flames; the same thing happens when he's defeated a second time in the Fiend Realm.
* EstablishingCharacterMoment: He's first seen looking down on a human army with disdain before demanding their surrender, then obliterating them mercilessly when they defy him.
* FantasticRacism: Calls humans as little more than "monkeys", even throwing Ryu into this category.
* GetBackHereBoss: Makes use of his wings to take to the air, forcing Ryu to either chase him down or wait for him to land.
* OneManArmy: His introductory cutscene has him delivering a CurbStompBattle to a well-armed modern army.
* PlayingWithFire: With a title like Ruler of Flames, it should come as no surprise he wields a variety of fire-based attacks.
* RedEyesTakeWarning: Adds to his demonic appearance
* ShootingSuperman: The military of the city he attacks unleash a full artillery strike on him to absolutely no effect.
* TitleDrop: He invokes the name of his chapter when ordering the military to surrender.
* WingedHumanoid: Bat-like wings typical of fictional demons


[[folder:Dagra Dai]]

-> Voiced by: Shōzō Iizuka (JP), Peter Reneday (EN)
-> Debuting in: ''Ninja Gaiden II''

Originally a human philosopher in ancient times, Dagra Dai roamed the earth while the Fiends battled for supremacy. Stumbling upon the resting place of the Supreme Archfiend Vazdah, Dagra Dai gazed into its eyes and was [[TranshumanTreachery transformed into a Fiend]]. Taking on the title of "Infernal High Priest", he brought the Four Greater Fiends together under the Archfiend's banner. In the present, Dagra Dai serves as the second main antagonist of ''Ninja Gaiden II'', having orchestrated the release of the Greater Fiends and the ritual that will ensure Vazdah's resurrection.
* AllThereInTheManual: His back-story is only revealed through in-game documents; otherwise, he's more or less a GiantSpaceFleaFromNowhere.
* CombatTentacles: After going OneWingedAngel
* TheDragon: To Archfiend Vazdah
** CoDragons: With Elizébet
** DevourTheDragon: A willing example - Dagra Dai sacrifices himself to the Archfiend in order to complete its resurrection.
* DualWielding: Fights Ryu with a pair of golden swords.
* GameBreakingBug: Team Ninja had to patch the boss fight with him in ''Ninja Gaiden II'' when it was nearly impossible to fight him without having the game crash.
* HumanoidAbomination: Looks more humanoid than the Greater Fiends until those CombatTentacles sprout from his back
* OneWingedAngel: Immediately adopts this form when Ryu breaks into his lair
* OrcusOnHisThrone: He prefers to let Elizébet take care of setting the other Greater Fiends loose, and only comes into play at the very end when performing the ritual to resurrect Vazdah.



-> Voiced by: Creator/RyuzaburoOtomo (JP), Creator/NeilKaplan (EN)
-> Debuting in: ''Ninja Gaiden II''

A Master Ninja and Overlord of the Black Spider Ninja Clan, Genshin is the best and most ruthless ninja the clan has ever created, with eternal lust for power and hatred towards the Dragon Ninja Clan. He didn't think twice when Elizébet offered him more power for his clan and an excuse to anihililate the Dragon Lineage. Genshin destroyed a great part of the Dragon Ninjas' village up to fighting against Joe Hayabusa, and managed to steal the Demon Statue for Elizébet. Throughout ''Ninja Gaiden II'', Ryu is forced to duel with the Master Ninja multiple times, killing him on the third, but Genshin is [[OneWingedAngel resurrected by Elizébet as a Greater Fiend]]. Ryu prevails and finishes Genshin off once and for all. Despite his hate for the Dragon Lineage, both Master Ninjas develop a mutual respect for another.
* AboveGoodAndEvil: Joe accuses the Black Spider Ninja Clan to be corrupted by evil, but Genshin remarks the {{Ninja}} way knows neither good nor evil.
* AnimalMotifs: The spider, given what his clan's named after; even his armor sports this theme more so than the clan {{Mook}}s.
* ArchEnemy: Of the Dragon Lineage
* AsskickingEqualsAuthority: Not only does he hold the rank of Master Ninja for the Black Spider Ninja Clan, but he is so much stronger than any other clan members he's given the title of Overlord.
* BackFromTheDead: Dies in his third fight, resurrected by Elizébet into a Greater Fiend
* {{Badass}}: Is the only other Master Ninja sans Joe Hayabusa in the modern trilogy to display just how powerful a {{Ninja}} of this rank truly is.
* BenevolentBoss: While Genshin is credited for being a ruthless, violent Overlord, many Black Spider Ninjas adore him; diary entries note how respectable Genshin is from the {{Mook}}s.
* {{BFS}}: Blade of The Archfiend
* DarkSkinnedBlond: A male variation
* DrivenByEnvy: The Black Spider Ninja Clan being in the Dragon Ninja Clan's shadow for generations took its toll on Genshin, who grew to hate the Dragon Lineage entirely; [[ItsPersonal their downfall is his ultimate goal]].
* FaceDeathWithDignity: Despite being at death's door, Genshin accepts his defeat gracefully, acknowledging Ryu's victory.
* LargeAndInCharge: Genshin borders on gigantic, towering over many Black Spider Ninjas that were converted into Fiends even when he's still human.
* LightningBruiser: Although much taller than most {{Ninja}}, Genshin is still just as agile and powerful befitting a Master Ninja, proving to be more than a match for Ryu.
* MirrorBoss: To an extent - Genshin can use the "Flying Swallow" technique, CounterAttack, the "Piercing Void" ninpo (''Sigma II'' only), has an "Ultimate Technique" similar to Ryu's as his Greater Fiend form, [[MegaManning and picks up a version]] of the [[SpinningPiledriver Izuna Drop]] in later boss fights.
* {{Ninja}}: Holds the rank of Master Ninja and clan Overlord status
* PlayingWithFire: In the last fight, Greater Fiend Genshin starts imbuing attacks with fire
* RecurringBoss: Fought a total of four times in a single play-through
* TheRival: As the game progress, he comes to hate Ryu less and less, and regards him as more of a WorthyOpponent. When Ryu defeats him for the last time, he peacefully passes on without regrets, his envy and hate finally dissipated.
* TakeUpMySword: Passes the Blade of the Archfiend to Ryu, who can use it alongside the True Dragon Sword. [[spoiler:After the Goddess is awakened in ''Ninja Gaiden III'', Genshin's spirit does this again to Ryu in a vision, while reactivating the power of the Blade]].



-> Voiced by: Mariko Suzuki (JP), Creator/KariWahlgren (EN)
-> Debuting in: ''Ninja Gaiden II''

A CIA agent tasked with to prevent Archfiend Vazdah from returning, Sonia heads to Tokyo to seek Ryu Hayabusa's help. Unlike Irene from the NES trilogy, Sonia is not so harmless, proving herself dependable and gutsy when Fiends aren't involved; throughout ''Ninja Gaiden II'', she provides the Dragon Ninja with support and transportation to where the Demon Statue might be located.
* ActionGirl: Sonia shows not even Fiends are a threat to her, to wit in the first cut-scene of the game, Sonia takes on experienced Black Spider Ninjas with nothing more than basic firearms.
* ActionGirlfriend: Invoked, ranging from raiding the "Daedalus" aircraft carrier with a [[{{BFG}} bazooka]] to a GunshipRescue after Ryu defeats Volf.
* DistressedDamsel: When captured by Black Spider Ninjas in the first chapter, then handed over to Elizébet; this occurs again with Alexei.
* FanServicePack: A notable small, red tattoo above her AbsoluteCleavage, wearing a SpyCatsuit showing off plenty of skin and a body figure comparable to the women of ''Dead or Alive''.
* FauxActionGirl: Despite fighting countless Black Spider and tactical ninja {{Mook}}s offscreen on the Daedalus, Sonia still falls prety to this quickly when stronger foes are involved; see DistressedDamsel.
* GunsAkimbo: Seen at the beginning of the game, where she even successfully kills two Black Spider Ninjas before getting captured.
* MsFanservice: {{Lampshaded}} - the CannedOrdersOverLoudspeaker aboard the Daedalus takes a moment out of relaying frantic messages through the ship to make note of Sonia's appearance.
* ShipTease: Sonia is the only girl in the modern games whom Ryu shows a degree of affection and care - he was worried about her wandering in the Underworld when he knows he can't protect her at all times, and they share a hug at the end of the game.
* SuspiciouslySimilarSubstitute: Sonia, a CIA agent tasked to work with Ryu, who frequently straddles between ActionGirl and FauxActionGirl to DistressedDamsel in the modern series replaces Irene Lew, another CIA agent with similar status situations in the NES trilogy. [[spoiler:''Dead or Alive: Dimensions'' makes no effort to reveal Sonia is one of Irene's ''aliases'']].
* VideoGameCrueltyPotential: You can make Ryu shoot an arrow against Sonia, while she is on view and caged in the Underworld, during a Boss Fight, doing so prompts Sonia to let out a death cry and that’s [[NonstandardGameOver an instant Game Over]].




!!Debuting in ''Ninja Gaiden III''


->Voiced by: Yumi Sudo (JP), Creator/StephanieSheh (EN)

Mizuki's daughter. She is a bit afraid of Ryu at first but quickly gets a liking to him.
* [[spoiler:AttackOfTheFiftyFootWhatever: That monster you slay at the beginning of vanilla ''Ninja Gaiden III'' ? Yeah, it's her.]]
* BreakTheCutie: She doesn't take [[spoiler: Ryu killing her father]] very well.
* ButNotTooForeign: She's a quarter Japanese, three-fourths-English.
* CuteMute: She uses her cell phone to communicate most of the time. She regains her speech near the end of the game.
* DistressedDamsel: She gets captured twice.
* [[spoiler:FinalBoss]]: [[spoiler:Transformed as a goddess and equipped with the Dragon Sword]].
* [[spoiler:HappilyAdopted: Mizuki is actually her biological aunt, but Canna doesn't really care about that.]]
* MoralityPet: Becomes one for Ryu.
* [[spoiler:MyGodWhatHaveIDone: After Ryu manages to change her back to normal, she is shown to be remorseful over what she said to him prior to her transformation.]]
* [[spoiler: OneWingedAngel: Rather unwillingly, courtesy of her uncle.]]
* ParentalAbandonment: Her parents died in an accident when she was very young. (Mizuki is her biological aunt, adoptive mother.) The resulting trauma caused her muteness.
* ShipperOnDeck: She really wants Ryu to be her daddy, which implies being more than JustFriends with Mizuki. For bonus points, they are literally on a deck when she says it to him.
* [[spoiler:YouKilledMyFather:]] "MURDEREEEEER!!!"

[[folder:Clifford "Cliff" Higgins]]
-> Voiced by: HiroakiHirata (JP), Jonathan Lipow (EN)

Mizuki's brother-in-law. She jokingly describes him as a MadScientist since he conceives strange advanced weapons such as Ryu's [[ItRunsOnNonsensoleum target-locking bow]]. [[spoiler: Turns out, he ''really'' is a MadScientist, responsible for bringing his brother Theodore back to life as the Regent of the Mask and turning Canna into what he calls a "Goddess".]]
* [[spoiler:AdamAndEvePlot:]] What he wants to do with [[spoiler:Canna]] of all people.
* [[spoiler: BigBad]]: [[spoiler: He's the main antagonist of Ninja Gaiden 3]]
* [[spoiler:EvilAllAlong]]
* [[spoiler:EvilUncle: To Canna.]]
* [[spoiler:EvilutionaryBiologist: Comes with the territory when you're a high-ranking member of the LOA.]]
* [[spoiler:GreenEyedMonster: His entire motivation wasn't his having been born into the Alchemy cult, but his jealousy of his seemingly perfect brother.]]
* [[spoiler:IncestSubtext: After he turns Canna into a huge monster and he begins to transform himself, he states that he will be the Adam to her Eve.]]
* [[spoiler:MakeItLookLikeAnAccident:]] [[spoiler:How he killed Canna's parents.]]
* [[spoiler:TheManBehindTheMan]]
* MissionControl: In Day 6, although [[{{Foreshadowing}} suspiciously unserious and unconcerned]]. He actually stops speaking to you as soon as you enter the first cavern in the level.
* [[spoiler: NoSell: When Ryu shoots an arrow at him during their fight, Cliff reminds him of who actually made it, and destroys it.]]
* [[spoiler:OneWingedAngel:]] In the last act.
* WalkingSpoiler: Duh.

-> Voiced by: Creator/HoukoKuwashima (JP), Creator/LaurenLanda (EN)

The second CanonImmigrant from the ''Videogame/DeadOrAlive'' series, debuting in the re-release for Wii U ''Ninja Gaiden 3: Razor's Edge'' as a free DLC character. Although she also got a very brief cameo in ''Sigma 2'', but only as TheFaceless.

Kasumi is the younger sister of Hayabusa's childhood friend Hayate, from the Mugen Tenshin Clan. She's also Ayane's older half-sister. In the ''Videogame/DeadOrAlive'' series, Hayabusa watches over her after she became a runaway ninja for avenging her brother.
* AbsoluteCleavage: When she wears her traditional blue and white costumes.
* ActionGirl: She already showed this trait in her own series, but here it shines even more.
* {{Badass}}: Again, cutting her enemies in half without flinching makes her look this even more than in ''Videogame/DeadOrAlive''. Which is saying something.
** BadassAdorable: She doesn't get to show her kind personality, but she's still a cute as ever.
** BadassCape: With her default costume. Specially created for ''Razor's Edge''.
** BadassPrincess: Or rather "Badass Heir of a Ninja Clan".
* BewareTheNiceOnes: [[RuleOfThree Even more than in her own series]]!
* BraidsOfAction: One of her alternative hair styles.
* BrownEyes: To illustrate her kind temper and that she's more down to earth than her half-sister.
* CanonImmigrant: From the ''Videogame/DeadOrAlive'' series.
* CherryBlossoms: Her motif, and appear from time to time while she fights.
* CleavageWindow: With her default costume, formed between the [[SpyCatsuit Ninja Catsuit]]'s cleavage itself and her BadassCape.
* TheFaceless: Her cameo in ''Ninja Gaiden Sigma 2''. We only get to see her from her back.
* FinishingStomp: Her version of the Izuna Drop, which is a variation of one of her grabs from the ''Videogame/DeadOrAlive'' series. She stomps her victim's head again and again in mid-air until she finally crushes it to the ground.
** EverythingsBetterWithSpinning: The "XXX>Y" variant has her grabbing her enemies and spinning backwards before crushing them, similarly to Ayane's drop.
* FuumaShuriken: She can combine her throwing knives to create one, including a PrecisionGuidedBoomerang effect. If fully charged, it can cut any enemy in two through the waist.
* FlashStep: Another of her trademark moves, albeit here appears as a game mechanic common to all characters.
* GoodIsNotSoft: She's still the nice, kind, ReluctantWarrior she was from her own series. Gentle however does not enter into the equation, she's basically a human ginsu that shows even the ''MortalKombat'' characters how disemboweling into itty bitty pieces is done.
* HighlyVisibleNinja: Albeit her costumes don't stand out as much as the other female characters, she's still not very concern with being seen.
* HimeCut: Her other alternative hair style, and arguably [[LettingHerHairDown the most popular one]].
* {{Kamehamehadoken}}: Her Ninpo, the Rending Wind. Its effect is similar to the Piercing Void, with the possibility of an additional radius attack at the end.
* JackOfAllStats: Similar to how she is in Dead or Alive, she is very balanced and has a lot of tricks up her sleeves.
** LightningBruiser: She can potentially be one of the best characters in the game in the hands of an advanced player. Whilst she doesn't have Ryu's ease of use nor his defense, she does have deadlier moves, just tricky to pull off. She's also the second fastest character after Ayane.
* KatanasAreJustBetter: Her famous wakizashi from ''Videogame/DeadOrAlive'' gets upgraded to a katana (although its length is closer to a ninjato).
* [[{{Ninja}} Kunoichi]]: And a pretty high ranked one in her own clan. Or at least, she used to.
* LadyOfWar: Despite being so young, she has a distinctive grace, even in her bloodier moments.
* PantyFighter: Three of her four costumes in ''Razor's Edge'' leaves her panties visible.
* RealLifeWritesThePlot: Itagaki was the sole reason Kasumi never appeared in Ninja Gaiden since day one. The creator was very vocal when saying that his "daughter" isn't the type of person who engaged in the same brutalities as Ryu did, phrasing that she was "too pure for this". By the time Kasumi made her cameo in ''Sigma II'', Itagaki was no longer part of ''Team Ninja/Koei Tecmo'', thus losing any reigns on the matter.
* ReverseGrip: She wields her katana this way, which is actually how ninjas usually wielded their ninjatos in RealLife.
* SheFu: Her agility is a view to behold.
* SpyCatsuit: Her default costume in ''Razor's Edge'', which comes from ''Dead or Alive 5'' (and looks suspiciously similar to the one Hayabusa wears), plus [[BadassCape a blue cape]] to boot.
* StockNinjaWeaponry: A ninjato-length [[KatanasAreJustBetter katana]], kunais (although the ones she actually trows look more like Western knives) and a FuumaShuriken (formed by said knives).
* TeleportSpam: A prominent aspect of her fighting style.
* TomboyishPonytail: Her default hair style.
* TookALevelInBadass: Or rather 'conformability in gore'. Previously, Kasumi was usually [[ReluctantWarrior reluctant to fight unless there was no other choice]]. Now she seems okay in splattering the blood of evildoers at first sight. Could be justified that during Tecmo's run with Itagaki, he explicitly wanted to avoid a bloody and gory environment for Kasumi. Since he left...
* TrueBlueFemininity: She leans toward this more than in her original series (the prominent blue cape in her [[SpyCatsuit Ninja Catsuit]], her iconic blue kimono and another, more traditional woman kimono).
* [[WhatHappenedToTheMouse What Happened to the New Costume?]]: In ''Sigma 2'' she wears a variation of her traditional blue costume. Although we only got to see the back side, fans really liked it and many of them were eager to see it properly. Too bad it hasn't appeared ever since, neither in ''Razor's Edge'' nor in the ''Videogame/DeadOrAlive'' series.
* WomanInWhite: Her famous second costume from the ''Videogame/DeadOrAlive'' series is available in ''Razor's Edge''.
* ZettaiRyouiki: In her traditional blue and white costumes.

[[folder:Ken Ishigami]]
-> Voiced by: Creator/UnshoIshizuka (JP), Creator/MichaelMcConnohie (EN)

A member of the Japanese ministry of defense, who meets Ryu at the beginning of the game, saying to him: "we don't need your help, you need ours", before showing him the message of the terrorists who took over London.
* MissionControl: In the last two missions.
* TraitorShot: In the middle of Day 3, he is shown to observe Cliff and Mizuki rather suspeciously through his [[ScreensAreCameras screen or… camera or whatever.]] [[spoiler:[[SubvertedTrope It turns out Cliff was the real traitor and Ishigami was suspicious of him.]]]]
* [[spoiler:UnwittingPawn:]] [[spoiler:LOA had infiltrated the ministry and ordered to send Ryu to London, but he only understood after they attacked the Yunagi.]]

[[folder:Ashtear Higgins]]
-> Voiced by: Kōji Yada (JP), Jamie Alcroft (EN)

The Chairman of the Lords of Alchemy multinational, which makes all sorts of things, from toys to war weapons. However, LOA's true research lies in combining old alchemical secrets with advanced science to bring about a new world...even if that means destroying the current one in the process.
* BigBad: As the chairman of LOA, he's the mastermind behind their plan to conquer the world...
** [[spoiler: DiscOneFinalBoss: Though you end up killing him before your final confrontations in the game.]]
* BaldOfEvil: Not a hair on his head, not a drop of conscience in his soul.
* CoolChair: He sits in a pretty sweet-looking combination of a wheelchair and a throne. It serves as the core and cockpit for his HumongousMecha
* EvilOldFolks: His advanced age is matched only by his lack of ethics.
* HumongousMecha: What he uses to fight Ryu. It includes...
** ArmCannon: Its arms end in powerful dual-barrel cannons.
** BeamSpam: Laser weaponry
** FireBreathingWeapon: The aforementioned [[ArmCannon Arm Cannons]].
** GoodThingYouCanHeal: Sort of--by devouring and assimilating nearby wreckage, it can convert the mass to re-configure itself if damaged.
** MacrossMissileMassacre: Multiple missile launchers located on its shoulders.
** ShockAndAwe: Its jaws house a powerful high-voltage emitter.
* {{Hypocrite}}: He denounces Ryu as some terrible "slayer of lives," yet his organization has been responsible for more than a few deaths up to this point.
* ManInWhite: He sports a natty white suit with a red shirt beneath. [[LightIsNotGood It serves to demonstrate his holier-than-thou complex.]]
* UtopiaJustifiesTheMeans[=/=]ItIsBeyondSaving: If his (long) MotiveRant before you finish him is anything to go by.

-> Voiced by: Creator/MasumiAsano (JP), Nicola Clarke (EN)

The chief scientist of LOA's gene labs.
* [[spoiler:AssholeVictim: Given her mocking and insulting treatment of Ryu, Canna, and Mizuki, she's easily among the ''least'' sympathetic of Ryu's RoguesGallery.]]
* InkSuitActor: [[ She looks a suspicious lot]] like her English voice actress.
* MadScientist
* [[spoiler: OneWingedAngel / BalefulPolymorph: She's pushed into her own experiment by the Regent of the Mask, transforming her into a creepy monster that Ryu has to defeat.]]
* [[spoiler:RasputinianDeath: She is thrown into her own experiment, has her arms cut off several times, is decapitated and finally has her head cut in two vertically. There is a good chance she's dead for good.]]
* TechnoBabble: She tries very hard to make her explanation of the Virtual Simulator sound meaningful.
* [[spoiler:WeHardlyKnewYe]] [[spoiler:Appears at the beginning of Day 4 and dies at the end.]]

[[folder:Mizuki McCloud]]
-> Voiced by: Creator/YukoKaida (JP), Creator/AliHillis (EN)

A member of the Japanese Air Defense Force, assisting Ryu throughout the third game.
* AcePilot: To pull off what she and [[spoiler:Robert T. Sturgeon]] do at the beginning of Day 7, you have to be at least this!
* AlliterativeName
* ButNotTooForeign: She's said to be half-English, half-Japanese.
* MissionControl: During the first three days. Although most of what she says during missions [[CaptainObvious doesn't really have any informative value.]]
* [[spoiler:ParentalSubstitute: To Canna, after the latter's real parents had an accident.]]
* ScrewTheRulesImDoingWhatsRight: She and Ryu unhesitatingly continue to fight against the Lords of Alchemy even after being criticized by the U.S. Army for their actions.
* StandardFemaleGrabArea: Borderline parodied if it weren't over with so quickly. She gets dragged away by one villain because she's got a gun to her back and is fearing for her daughter's life. When another villain appears grabbing her by the upper arm, she swats the hand away the second she sees her daughter safe.

[[folder:The Regent of the Mask]]
->Voiced by: Creator/KenyuHoriuchi (JP), James Brinkley (EN)


The BigBad of ''Ninja Gaiden 3'' [[spoiler:or so it seems at first]]. The game begins with him taking hostages in the middle of London with his terrorist group and assassinating the British Prime Minister. After fighting Ryu, he places a curse on his right arm, forcing the Dragon Ninja to endure the pain of all the people he killed. [[spoiler:He is also Canna's father and Cliff's brother, brought BackFromTheDead, brainwashed and used by LOA. He comes back to his senses and helps Ryu at the end of the game.]]
* ActionFigureSpeech
* AlchemyIsMagic
* [[spoiler:BackFromTheDead]]
* [[spoiler:BackToBackBadasses:]] With Ryu in the last level, similarly to Momiji.
* BadassLongcoat: Part of his attire.
* [[spoiler:BigDamnHeroes: He saves Ryu and kills OneWingedAngel Cliff in the last act]].
* [[spoiler:BrainwashedAndCrazy: By the Lords of Alchemy thanks to his mask. Destroying it causes his HeelFaceTurn.]]
* CombatCommentator: He sends amused comments at you during the boss fights of Day 3 and 4.
** Shooting an arrow at him whilst he watches you fight will have deflect the arrow effortlessly and laugh.
* CoolMask: Another part of his attire.
** MalevolentMaskedMan
** WhiteMaskOfDoom
* CoolSword
** RoyalRapier
* EvilCounterpart: To Ryu.
* FauxSymbolism: [[invoked]]
--> "Every nation must immediately agree to our terms of surrender. You have seven days. Exactly the number of days it took God to create this world."
* GlovedFistOfDoom: The third part of his attire.
* [[spoiler:GuestStarPartyMember: Joins Ryu on the final stage to help him get to Canna.]]
* [[spoiler:HeelFaceTurn:]] After his mask is destroyed.
* [[spoiler:HeroicSacrifice: Apparently, lifting the curse from Ryu's arm required to die by his hand.]] Talk about an AwesomeButImpractical curse!
* InTheHood: The final part of his attire.
* KickTheDog: The first thing we see him do is kill the freaking Prime Minister. The hostages probably didn't all get away alive either. And then there is him [[spoiler:pushing Lovelace into the egg; though, given that Lovelace had proven to be a mega-bitch herself, that probably counts more as KickTheSonOfABitch.]]
* LargeHam[=/=]MilkingTheGiantCow: Comes with the territory of going into lengthy esotheric speeches about God, the universe or the end of the world.
* LightningBruiser: One of the very few characters to match Ryu's speed, and whilst his slashing attacks aren't painful, it's his grabs that will absolutely destroy you.
* OccultBlueEyes
* [[spoiler: PapaWolf: Even if killing his daughter will result in saving the rest of the world, he won't let you hurt her.]] Later subverted [[spoiler: when he reveals that he'd intentionally said that in order to get the opportunity to free Ryu of the Grip of Murder and give him the chance to stop Canna, believing that Ryu can stop her without killing her.]] In the end, he was right.
* ReasonYouSuckSpeech: He takes pleasure in describing how horrifically brutal Ryu is to his enemies and others who get in the way of his missions. Being a stoic ninja, [[TheUnapologetic Ryu expresses no attempts to refute him and continues his ways]].
* RecurringBoss
* WakeUpCallBoss: He's not as unforgiving as Murai since your lifebar is maxed-out from the beginning in ''3'', but he's clearly the first enemy of the game that will pose you a challenge. In harder difficulties, he becomes ThatOneBoss.

!!Debuting in ''Yaiba: Ninja Gaiden Z''

[[folder:Yaiba Kamikaze]]
The main protagonist of this SpinOff game. He is killed by Ryu Hayabusa at the beginning and he is revived by Miss Monday. He's now a Cyborg Ninja working for Forge Industries as it uncovers the zombie infection that is spreading across Russia. Oh, and he wants Ryu Hayabusa. Really bad.
* AntiHero: In the trailers. In the full game, he's clearly a VillainProtagonist and admits as much.
* ArtificialLimbs: Has a robotic left arm.
* BackFromTheDead: [[spoiler:Which is upgraded to DeathIsASlapOnTheWrist later on.]]
* BetaCouple: With Miss Monday.
* TheBrute: A texbook example.
* BloodKnight: He is only interested in killing something.
* BullyingADragon: Knowing full well who he is and what he can do, he calls out Ryu. Yaiba is then [[CurbStompBattle curbstomped by Ryu]]. [[spoiler:Twice.]]
* DeadpanSnarker: To Miss Monday.
* [[spoiler:DeathIsASlapOnTheWrist: He dies two more times. He survives from a thousand-meter Izuna Drop by Ryu and Miss Monday revives him once more after he freed (and killed) himself from Del Gonzo's control. At the start of their fight, Ryu even lampshades it.]]
--> [[spoiler:'''Ryu''': "Why won't you stay dead?"]]
* ElementalPowers: He has fire, lightning, and ''bile'' as both his strengths and weaknesses.
* EleventhHourSuperpower: Monday gives him an upgrade ''mid-battle'' to [[spoiler:counterattack Ryu's True Inferno]]
* ExplosiveLeash: Has one in his heart to ensure that he is doing his job.
* {{Expy}}: To {{Deadpool}} (personality,though he's a lot darker), [[VideoGame/MetalGearRisingRevengeance Raiden]] (cybernetics), and Ryu Hayabusa (revenge) himself.
* [[spoiler:HeroicSacrifice: Not intended to be, but he saves Ryu and Momiji from his ExplosiveLeash (by ripping it out along with heart) which was about to be activated by Del Gonzo.]]
* ImprovisedWeapon: He "creates" his weapons out of severing zombies and gigantic robot dogs.
* ItsPersonal: He just wants to kill Ryu.
* JerkAss: That is an understatement.
** JerkWithAHeartOfGold: [[spoiler:Ryu, of all people, believes that Yaiba still has goodness left in him.]]
** JerkWithAHeartOfJerk: Though Yaiba is more proud being this.
* LargeHam
* MeaningfulName: Kamikaze means "Divine Wind". The kanji 風 in his robotic left arm reads as "kaze", meaning "wind".
* NotSoDifferent: In Miss Monday's research of Ryu, she compares him to Yaiba about how similar they are. Both men were easily killed in an encounter, brought back to life, and have been on extracting revenge.
* RoaringRampageOfRevenge: His very reason of joining Forge Industries, he wants to get his hands on Ryu.
* SirSwearsALot: Easily the most foul-mouthed character in the whole series.
* SmallNameBigEgo: Just another random mook that Ryu slaughtered.
* SwissArmyWeapon: His robotic left arm is one.
* UnwittingPawn: [[spoiler:Del Gonzo takes advantage of his revenge against Ryu so he can stop him from thwarting his plans.]]
* VillainProtagonist: There's not even a shred of good in him.

[[folder:Miss Monday]]
The HotScientist who brought Yaiba back to life via cybernetics. She serves as his MissionControl during his investigation of the zombie outbreak.
* BetaCouple: With Yaiba.
* BiTheWay / DepravedBisexual: Implied. While she has an interest for Yaiba, in her research of Momiji, she takes a liking for her outfit and even pops a "lady boner".
* EvilGenius / MadScientist: It was she who reconstructed Yaiba and she was shown to possess extensive knowledge of technology and cybernetics. She's also quite wicked and depraved.
* HotScientist: Yaiba actually suspects she is just a hologram and that she can't even exist or is actually a very ugly old woman.[[spoiler: Nope. He's wrong]].
* ILoveTheDead: Despite repeatedly rebuffing Yaiba's come-ons, [[spoiler: she did already have sex with him once: [[{{Squick}} while she was in the process of rebuilding him]].]]
* MissionControl: Along with Del Gonzo.
* MsExposition: As MissionControl, that is a given.
* MsFanservice: She wears a skimpy outfit with an open shirt displaying an ample bust.
* TechnoBabble: In the first mission, she explains Yaiba about his cybernetic enhancements.

[[folder:Alarico Del Gonzo]]
The boss of Forge Industries which Miss Monday and subsequently Yaiba work for. [[spoiler:He is also the one responsible for the whole zombie outbreak.]]
* [[spoiler:AttackOfThe50FootWhatever: In the final mission.]]
* [[spoiler:DarkLordOnLifeSupport]]
* [[spoiler:EvilAllAlong]]
* {{Expy}}: [[spoiler:To Cliff Higgins of ''Ninja Gaiden III''.]]
* [[spoiler:FinalBoss:]]
** [[spoiler:FinalExamBoss: By the time you fight him, you should know all the ElementalPowers combinations to damage him.]]
* [[spoiler:ManipulativeBastard: He's responsible for the zombie outbreak in Russia and takes advantage of Yaiba's revenge against Ryu so he can get rid of the latter from foiling his plans.]]
* ManOfWealthAndTaste
* MissionControl: Along with Miss Monday. [[spoiler:After his VillainousBreakdown, he taunts Yaiba.]]
* [[spoiler:VillainousBreakdown: According to Miss Monday, after Yaiba and Ryu foil his plans he has gone insane and has killed some people.]]
* WalkingSpoiler