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''Mega Man X4'' is the fourth entry in the ''VideoGame/MegaManX'' series, released on the {{Playstation}} and SegaSaturn on July 1997 in Japan, August 1997 in North America, and October 1997 in Europe. It was also the first ''Mega Man X'' game not to be released on the SuperNintendoEntertainmentSystem.

[[ExtyYearsFromNow In the year 21XX]], two large reploid armies to combat the outbreak of Mavericks exist, the Maverick Hunters including X and Zero, and the Repliforce. The two great organizations have worked together several times to counter Maverick activity, and it was during this time that Zero gets to know the Colonel and his sister Iris of the Repliforce. With the Maverick Hunters, X has also befriended a new ally, a clumsy rookie named Double.

But one day, the aerial city of Sky Lagoon is targeted by Mavericks, causing it to crash to the earth causing thousands of causalities. As Repliforce was in the area during the attack, they are asked to disarm themselves and come in for questioning, however the Colonel refuses due to his pride. To make matters worse the Repliforce leader, General, launches a coup d'état to start a nation only for Reploids to exist, which soon causes him and the entirety of Repliforce to be labeled as Mavericks by the government, forcing the Maverick Hunters to turn against their once allies.

Mavericks:
* Web Spider of Repliforce, gives [[FloatingPlatforms Lightning Web]] to X, and [[ShockAndAwe Raijingeki]] to Zero
* Magma Dragoon of the 14th Special Unit, gives [[PlayingWithFire Rising Fire]] to X, and [[FlamingSword Ryuenjin]] to Zero
* Storm Owl of Repliforce, gives [[RazorWind Double Cyclone]] to X, and [[ImplausibleFencingPowers Tenkuuha]] to Zero
* Split Mushroom of Sigma's forces, gives [[SelfDuplication Soul Body]] to X, and [[SpinAttack Kuuenzan]] (as well as [[DoubleJump Kuuenbu]]) to Zero
* Frost Walrus of Repliforce, gives [[ElementalBarrier Frost Tower]] to X, and [[AnIcePerson Hyouretsuzan]] to Zero
* Slash Beast of Repliforce, gives [[SpreadShot Twin Slasher]] to X, and [[DeadlyLunge Shippuuga]] to Zero
* Jet Stingray of Repliforce, gives [[MookMaker Ground Hunter]] to X, and [[VideoGameDashing Hienkyaku]] to Zero
* Cyber Peacock of Sigma's forces, gives [[PlayerGuidedMissile Aiming]] [[FrickinLaserBeams Laser]] to X, and [[SmartBomb Rakuhouha]] to Zero

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!!Tropes:
* AscendedExtra: Zero was technically PromotedToPlayable in ''[[VideoGame/MegaManX3 Mega Man X3]]'', but this game allows him to be chosen as the main playable character from the start, and gives a lot of CharacterDevelopment. Unlike X, he gains 3 cutscenes involving him whereas alongside X's ending where he worries about being a Maverick and Double's betrayal.
* BilingualBonus: All of Zero's sword techniques retain their original Japanese names, for instance; Raijingeki translates to ''"Thunder God Attack"'' and Ryuenjin means ''"Dragon Flame Blade"''.
* BloodKnight: Magma Dragoon sabotages [[ColonyDrop Sky Lagoon]] and kills thousands just to force X or Zero to have to fight him in a final duel to the death.
* BossSubtitles: After choosing which stage to enter, it begins with a single paragraph explaining what the Maverick did, along with the Maverick's name and sprite. Also, a TitleScream of the boss's name.
* BossWarningSiren: This game introduced them to the series.
* TheCameo: [[VideoGame/MegaManX1 Chill Penguin]] and [[VideoGame/MegaManX3 Blizzard Buffalo]] can be seen frozen in the background of Frost Walrus's stage.
* CharacterDevelopment: Zero gets a lot of development in this game, something that would continue in the next games.
* ColonyDrop: Sky Lagoon during the intro stage.
* DarkerAndEdgier: For the first time, the Maverick label is used on a group not infected with the Sigma Virus (though Repliforce may or may not have brought it on themselves by being so stubborn) and Zero's ties to Dr. Wily are revealed, not to mention [[spoiler: Iris' death, which would continue to haunt Zero after the game.]]
* DesignatedLoveInterest: Iris to Zero, they got together sometime between ''[[VideoGame/MegaManX3 Mega Man X3]]'' and this game, and don't share much romantic screentime in the game proper [[spoiler:before Iris's death]].
* [[spoiler:DiedInYourArmsTonight: Iris dies in Zero's arms]].
* [[spoiler:DoubleAgent: [[MeaningfulName Double.]]]]
* EasyLevelsHardBosses: When playing as Zero. His agility makes him great in the main stages, but since he gains new ''moves'' rather than new weapons, he can't always exploit the bosses' weaknesses. He has no animation-interrupting move against Slash Beast and Magma Dragoon, for instance.
* {{Expy}}: Magma Dragoon is pretty much Akuma as a dragon reploid.
* FaceHeelTurn: Former Maverick Hunter, Magma Dragoon.
** Once accused of turning Maverick, Repliforce starts a coup d'état to create a seperate nation only for Reploids.
** [[spoiler:Iris turns on Zero after Zero kills her brother]].
* FireIceLightning: Magma Dragoon, Frost Walrus, and Web Spider respectfully.
* FlyingSeafoodSpecial: Jet Stingray, as well as the Kill Fisher enemies in Web Spider's stage.
* FlunkyBoss: Web Spider and Jet Stingray can shoot out spider and stingray drones respectively. Meanwhile Split Mushroom can deploy multicolored clones of himself, as well as creating a real body double.
* GiantSpider: Web Spider of the Repliforce.
* TheGrimReaper: [[spoiler:Sigma]] disguises himself in a Grim Reaper motif, complete with black robes, [[TheFaceless shadowed face]], and a [[SinisterScythe Sinister]] [[LaserBlade Laser Scythe]].
* HardLevelsEasyBosses: When playing as X. As usual, you can rip through bosses like nothing if you know their weaknesses, many of which [[AIBreaker interrupt the boss's attacks,]] and even weaken them beyond damage dealt.
* HeroicSacrifice: [[spoiler:General ends up sacrificing himself to stop the KillSat Sigma had commandeered to KillAllHumans]].
* [[spoiler:[[HijackedByGanon Hijacked By Sigma]]]]: To the point that Split Mushroom [[LampshadeHanging lampshades]] this if you're playing as X.
* HonorBeforeReason: After the Sky Lagoon incident, Colonel refuses to disarm his troops to come in for questioning out of pride, which [[AllThereInTheManual combined with their lacklustre performance on the field]], which makes Repliforce as a whole look suspicious.
** Several Repliforce generals, including Storm Owl and Jet Stingray, start attacking innocent civilians in order to drive attention to themselves and away from Repliforce as they prepared to launch into space. This, of course, simply justifies the mandate that Repliforce has turned Maverick and must be destroyed.
* HumongousMecha: Eregion is as tall as the screen. Frost Walrus is possibly the largest "eight stage bosses" character in all of Mega Man (although Rainy Turtloid from ''VideoGame/MegaManX6'' is the largest Maverick boss in whole X series), as he stands at 3/4 of the screen height, even larger than [[VideoGame/MegaMan8 Frost Man]].
* InstantAwesomeJustAddDragons: [[WarmupBoss Eregion]] and Magma Dragoon.
* [[spoiler: KillEmAll: Every character in ''X4'' except X and Zero are dead by the end of the game]].
* KillSat: The Repliforce space station[[spoiler:, Sigma plans on using the space laser to destroy all life back on earth]].
* KingOfBeasts: Slash Beast is a lion reploid, and he certainly acts the part.
* LaserBlade: Zero's primary weapon, his Z-Saber.
* LightningBruiser: Slash Beast is quite strong and hardy, and fast enough to outrun a moving train.
* TheMole: [[spoiler:Double]].
* MonstrosityEqualsWeakness: Eregion is the second-largest boss in the game and is [[WarmupBoss also the most pathetic]].
* MushroomMan: Split Mushroom.
* {{Narm}}: [[spoiler:IRIS!]] THERE IS NO REASON FOR ME TO GO ON! WHAT AM I FIGHTING FOOOOOOOOOOOOAAAARRRR!
* NaiveNewcomer: Double is a new rookie Maverick Hunter who likes to tag along with X[[spoiler:, [[ObfuscatingStupidity or so it]] [[TheMole would seem]]]].
* NiceHat: Many Repliforce officers wear one, like Colonel, General, Web Spider, Jet Stingray and Storm Owl.
* NotHelpingYourCase: Even when it turns out that Repliforce didn't do anything to the Sky Lagoon at all, they don't do much to cover themselves either - see HonorBeforeReason for why.
* ObfuscatingStupidity: [[spoiler:Double]].
* OminousOwl: Storm Owl.
* [[PeacockGirl Peacock Guy]]: Cyber Peacock. Even though he's not female, he acts a little campy.
* [[PromotedToPlayable Promoted To Fully Playable]]: Zero.
* RememberTheNewGuy: Repliforce, we're made to understand they've been around for awhile and have worked with the Maverick Hunters on several occassions. Based on the memo in the accompanying booklet, they had been established after the third game.
* SchrodingersPlayerCharacter: X briefly talks to Zero during his ending. This is the only time they interact once you choose your character.
* ShoutOut: Magma Dragoon is a big one to Akuma of the ''Franchise/StreetFighter'' franchise, he even uses the {{Shoryuken}} and the [[KamehameHadoken Hadoken]] by name.
** When he does the Twin Slasher, Slash Beast does a somersault akin to Guile's Flash Kick.
* {{Shotoclone}}: Magma Dragoon
* SinisterScythe: [[spoiler:[[BigBad Sigma]]]] uses a [[LaserBlade Laser Scythe]].
* TeleportSpam: Cyber Peacock and Colonel.
* UtilityWeapon
** [[ShockAndAwe Lighting Web]] can be used to make an [[ImprovisedPlatform improvised wall]] for X to WallJump off of.
** [[PlayingWithFire Rising Fire and Ryuenjin]] can burn wooden logs.
** A [[ChargedAttack fully charged]] Twin Slasher can be used to break away heavy stone blocks.
* WarmupBoss: Eregion, the bipedal dragon Mechaniloid of the Sky Lagoon stage.
* WhenAllYouHaveIsAHammer: Zero only has his [[LaserBlade Z-Saber]], so most of his upgrades give him more powerful or versatile sword techniques.
* XanatosGambit: [[spoiler:Sigma]] pulls one here; If either the Maverick Hunters or Repliforce wins, he can aim the Final Weapon on the Earth. The only reason he plans fails was because [[spoiler: General survive his fight with X and Zero and stops the weapon himself.]]
* ZeroEffortBoss: Most of the eight Mavericks become pushovers if you have their weakness handy. As long as you hit them as soon as you're able (which isn't difficult) they become locked into a pattern where some of them can't even attack, they get hit, fly off-screen or teleport, then reappear to get hit again.
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