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Villains Wiki

This Villain was proposed and approved by Villains Wiki's Pure Evil Proposals Thread. Any act of removing this villain from the category without a Removal Proposal shall be considered vandalism (or a futile "heroic" attempt of redemption) and the user will have high chances of being terminated blocked. You cannot make said Removal Proposal without permission from an admin first.
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Villain Overview

Bwah ha ha ha. Your efforts are futile... I will never be defeated! As long as Mavericks exist... As long as evil exists in the minds of humans... I'll come back again and again! X, Zero... I'll pursue you to the end of the world! Bwah ha ha ha! Farewell! FOR NOW!! Bwah ha ha!
~ Sigma.
Gha ha ha ha ha...! Isn't it painful to have to watch while others suffer? You can put up with your own pain......but can't bear to see others, especially Zero, harmed, can you? I'm taking Zero, the one most important to you... to the underworld! Goodbye, X... Gha ha ha ha!
~ Sigma.
It's not over yet, X! The battle! The angst! The destruction! I will make you understand the true potential of Reploids!
~ Sigma
Listen well, X. There are times where we Maverick Hunters cannot afford to hesitate in pulling the trigger. We must become sword and shield to those who cannot protect themselves. That is our sworn duty, never forget that.
~ Sigma giving advice to X, when still a Maverick Hunter.

Sigma is the supreme commander of the Mavericks and the main antagonist in the Mega Man X video game series, serving as the main antagonist and final boss for most games of the series (except for Mega Man X8 and Mega Man X: Command Mission). He is X and Zero's arch-nemesis.

He is voiced by Mugihito in Japanese for Mega Man X4, and has different English dubbed voices per appearance, with Jim Byrnes in the Mega Man cartoon, Charlie Fontana in Mega Man X4, Walter Roberts in Mega Man X7, Dave Pettitt in Mega Man X8, Gerald Matthews in Mega Man Maverick Hunter X, and Chris Tergliafera in Marvel vs. Capcom: Infinite.


Original canon

While originally a noble warrior who only desired to accomplish his tasks and keep peace by destroying the mavericks, once the virus took over him, Sigma progressively became a monster, hellbent in eliminating humanity.

While in the original game Sigma shows traces of believing that what he is doing is in the best interest of the reploids, in later entries, his actions seem out of hatred of X and Zero, and to cause as much damage as he can.

Sigma has an interesting trait that sets him apart from the other villains in the Mega Man X series. While most other Reploids lose control of their inhibitions and conscious though, and, for lack of a better term, go insane, Sigma does not. He is able to study and learn new things, such as the reasoning for X's constant worry, Zero's shady past, among other things. He is even able to conceptualize grand-scale plans and effectively strategize while in this state. With most infected Mavericks, we never see their true personality, as it is masked by the virus. However, Sigma shows his true personality all throughout. He is a bossy, brilliant, and destructive military strategist who uses this to his full advantage.

His obsession with destroying humanity as well as X and Zero stems from the virus, but one thing that has always set Sigma apart is that he doesn't lose control of himself. Mega Man X6 might be the singular exception, because Sigma wasn't all there due to the damage inflicted on him in the previous game.

Sigma has always been very discerning, intelligent, perspicacious, and imaginative, and remains so. He keeps his enemies' weaknesses in mind and preys on them (such as X's big heart, Zero's wanting to block out all mention of his bloody past, or Axl's discontent at being called a prototype). Sigma's personality itself, post-infection, has been very manipulative, ruthless, power-hungry, and sadistic. He controlled Dr. Doppler into distributing a placebo antivirus which was instead the virus, manipulated the Colonel and the General of the Repliforce (a military-like group meant to compliment the Maverick Hunters) into a full-scale war, and Blackmailed the leader of the mercenary Maverick hunting group Red Alert, Red with his infected and mind controlled friends into cooperating with him in fighting the Hunters.




  • Mega Man X (first archenemy)
  • Zero (second archenemy)
  • Axl
  • Mega Man
  • Proto Man
  • Dr. Wily (sometimes)
  • Ryu
  • Ken Masters
  • Chun-Li
  • Guile
  • Charlie Nash
  • Vega
  • Balrog
  • Dante Sparda
  • Arthur
  • Firebrand
  • Morrigan Aensland
  • Amaterasu
  • Issun
  • Viewtiful Joe
  • Sexy Sylvia
  • Monster Hunter (Character)
  • Felyne
  • Palico
  • Gore Magala
  • Sonic the Hedgehog
  • Miles "Tails" Prower
  • Sally Acorn
  • Bunnie Rabbot D'Coolette
  • Antoine D'Coolette
  • Rotor the Walrus
  • Nicole the Holo-Lynx
  • Knuckles the Echidna
  • Amy Rose
  • Cream the Rabbit
  • Shadow the Hedgehog
  • Silver the Hedgehog
  • Metal Sonic
  • Dr. Ivo "Eggman" Robotnik
  • Orbot
  • NiGHTS
  • Reala
  • Billy Hatcher
  • Rolly Roll
  • Chick Poacher
  • Bantam Scrambled
  • Kyle Fluge
  • Blue Dragon
  • Vyse
  • Aika
  • Fina
  • Cupil
  • Gilder
  • Enrique
  • Drachma
  • Gilius Thunderhead
  • Tyris Flare
  • Ax Battler
  • Alex Kidd
  • Stella
  • Iron Man
  • Captain America
  • Thor Odinson
  • The Hulk
  • Hawkeye
  • Spider-Man (Peter Parker)
  • Captain Marvel (Carol Denvers)
  • Thanos


  • Sigma once fought Ultron in the popular internet show DEATH BATTLE and lost.
  • Sigma's design was made by fusing together the designs of three other villains who were used in early development of Mega Man X. Those designs were later used for basis for the X-Hunters.
    • In addition, his design does look similar to M. Bison's and Sagat's designs, and several fans have drawn comparison from his design and Braiking Boss.
  • In a 2008 Q+A, Keiji Inafune revealed that Sigma's design represents the idea of the impossibility of something being absolute.
  • Sigma is the 18th letter of the Greek Alphabet, which fits due to his main foe being X, it being used to show infinite or finite sums of variables, and derives from the Phoenician letter Sheen, which looks similar to the letter W, a possible reference to Dr. Wily.
  • Across the lore of the Mega Man X series, there are three different explanations on how Sigma got his scars:
    • From either a battle with X, seen in The Day of Σ OVA)
    • From batting Zero, seen in X4
    • They were self inflicted, shown directly in the Rockman X manga and hinted in the Mega Man X 2017 novelization.
  • His Benial form from Megaman X8 looks similar to Abyss from the Marvel VS Capcom series.
  • If Sigma is used as the player's name in Mega Man 9, the game will censor it to "Si**a", possibly due to it resembling a offensive slur.
  • In Mega Man X8, Sigma's copy is weak to Dark Mantis' weapon, while his real form is weak to Optic Sunflower's weapon. This fits, as both are themed around dark and light respectfully.
  • In Mega Man X, Sigma's final form has no arms. However, Maverick Hunter X gives the form arms.

External Links

  • Sigma on the Pure Evil Wiki.


Mega man logo.png Villains
Mega Man Classic

Wily Labs
Dr. Wily | Dr. Cossack | Bass | Devil Series | Gamma | Mega Man Killers (Enker | Punk | Ballade) | Quint | Copy Mega Man | Doc Robot | Dark Man | Ra Moon | Mettaurs | Sniper Joes

Robot Masters
Light Numbers: Cut Man | Guts Man | Ice Man | Bomb Man | Fire Man | Elec Man | Time Man | Oil Man | Concrete Man | Tornado Man | Splash Woman | Plug Man | Jewel Man | Hornet Man | Magma Man | Galaxy Man

Wily Numbers: Metal Man | Air Man | Bubble Man | Quick Man | Crash Man | Flash Man | Heat Man | Wood Man | Needle Man | Magnet Man | Gemini Man | Hard Man | Top Man | Snake Man | Spark Man | Shadow Man | Gravity Man | Wave Man | Stone Man | Gyro Man | Star Man | Charge Man | Napalm Man | Crystal Man | Blizzard Man | Centaur Man | Flame Man | Knight Man | Plant Man | Tomahawk Man | Wind Man | Yamato Man | Freeze Man | Junk Man | Burst Man | Cloud Man | Spring Man | Slash Man | Shade Man | Turbo Man | Tengu Man | Astro Man | Sword Man | Clown Man | Search Man | Frost Man | Grenade Man | Aqua Man | Blade Man | Pump Man | Commando Man | Chill Man | Sheep Man | Strike Man | Nitro Man | Solar Man | Block Man | Fuse Man | Blast Man | Acid Man | Tundra Man | Torch Man | Impact Man | Bounce Man | Genesis Unit (Buster Rod G | Mega Water S | Hyper Storm H)

Cossack Numbers: Bright Man | Toad Man | Drill Man | Pharaoh Man | Ring Man | Dust Man | Dive Man | Skull Man

Stardroids: Terra | Sunstar

King Army: King | Dynamo Man | Cold Man | Ground Man | Pirate Man | Burner Man | Magic Man

Evil Robot

Mega Man X

Sigma | Vile | Armored Armadillo | Berkana | Boomer Kuwanger | Bospider | Bubble Crab | Chill Penguin | Crescent Grizzly | Crystal Snail | Cyber Peacock | Dark Necrobat | Double | Dynamo | Flame Mammoth | Flame Stag | Gareth | Geemel | Launch Octopus | Magma Dragoon | Magna Centipede | Mechaniloids | Morph Moth | Nightmare Phenomenon | Overdrive Ostrich | Shining Firefly | Spark Mandrill | Spike Rosered | Split Mushroom | Sting Chameleon | Storm Eagle | Tidal Whale | Wheel Gator | Wire Sponge | Volt Kraken | X Hunters (Agile | Violen | Serges) | Zain

Doppler Army: Dr. Doppler | Blast Hornet | Blizzard Buffalo | Crush Crawfish | Gravity Beetle | Mac | Neon Tiger | Nightmare Police (Bit | Byte) | Toxic Seahorse | Tunnel Rhino | Volt Catfish

Repliforce: General | Colonel | Web Spider | Storm Owl | Slash Beast | Frost Walrus | Jet Stingray | Burn Dinorex | Spiral Pegasus

Nightmare Investigators: Gate | Isoc | High Max | Blaze Heatnix | Blizzard Wolfang | Commander Yammark | Ground Scaravich | Infinity Mijinion | Metal Shark Player | Rainy Turtloid | Shield Sheldon

Red Alert Syndicate: Red | Soldier Stonekong | Splash Warfly | Flame Hyenard | Wind Crowrang | Snipe Anteator | Vanishing Gungaroo | Tornado Tonion | Ride Boarski

New Generation Reploids: Lumine | Avalanche Yeti | Bamboo Pandamonium | Burn Rooster | Dark Mantis | Earthrock Trilobyte | Gigabolt Man-O-War | Gravity Antonion | Optic Sunflower

Rebellion Army: Epsilon | Colonel Redips

Mega Man Zero

Neo Arcadia: Copy X | Crea & Prea | Dark Elf | Dr. Weil | Omega

Resistance: Elpizo

Four Guardians: Sage Harpuia | Fairy Leviathan | Fighting Fefnir | Hidden Phantom

Mutos Reploids
Harpuia's Forces: Aztec Falcon | Herculious Anchus | Kuwagust Anchus | Panter Flauclaws

Fefnir's Forces: Anubis Necromancess

Leviathan's Forces: Blizzack Staggroff | Poler Kamrous | Maha Ganeshariff

Phantom's Forces: Hanumachine | Hyleg Ourobockle | Phoenix Magnion | Burble Hekelot

Eight Gentle Judges: Childre Inarabitta| Blazin' Flizard | Devilbat Schilt | Glacier le Cactank | Cubit Foxtar | Volteel Biblio | Deathanz Mantisk | Tretista Kelverian

Einherjar Eight Warriors: Sol Titanion | Heat Genblem | Popla Cocapetri | Pegasolta Eclair | Mino Magnus | Noble Mandrago | Techj Kraken | Fenri Lunaedge | Craft

Mega Man ZX

Aeolus | Atlas | Master Albert | Model W | Serpent | Siarnaq | Thetis

Bifrost | Fistleo | Hedgeshock

Mega Man Legends

Birdbots | Bola | Bonne Family ( Teisel Bonne, Tron Bonne, and Bon Bonne) | Glyde Loathe | Klaymoor | Lex Loathe | Megaman Juno | Mistress Sera | Reaverbots | Servbots

Mega Man Battle Network

World Three
Operators: Lord Wily | Mr. Match | Ms. Madd | Higsby | Count Jack Zap | Yahoot | Anetta | Takeo Inukai | Rei Saiko | Noboru Sunayama | Professor | Baryl | Joe Mach | Captain Blackbeard | Vic | Prosecutor Ito | Yuika
NetNavis: FireMan.EXE | NumberMan.EXE | ColorMan.EXE | ElecMan.EXE | MagicMan.EXE | StoneMan.EXE | BombMan.EXE | PlanetMan.EXE | NapalmMan.EXE | PharaohMan.EXE | FlameMan.EXE | PlantMan.EXE | BeastMan.EXE | FlashMan.EXE | DesertMan.EXE | BubbleMan.EXE | DrillMan.EXE | Bass.EXE | Colonel.EXE | BlastMan.EXE | DiveMan.EXE | ElementMan.EXE | JudgeMan.EXE | CircusMan.EXE | StarMan.EXE | SwordMan.EXE | Zero.EXE | GravityMan.EXE | Cybeasts
Others: Life Virus

Operators: Sean Obihiro | Magnus Gauss | Arashi Kazefuki | Speedy Dave | Dusk | Princess Pride
NetNavis: MagnetMan.EXE | AirMan.EXE | QuickMan.EXE | ShadowMan.EXE | CutMan.EXE | FreezeMan.EXE | KnightMan.EXE

Nebula: Dr. Regal
Darkloids: LaserMan.EXE | ShadeMan.EXE | CosmoMan.EXE | BlizzardMan.EXE | CloudMan.EXE | Dark MegaMan.EXE | Dark ProtoMan.EXE | Duo.EXE | Nebula Grey

Alpha | BrightMan.EXE | BurnerMan.EXE | BowlMan.EXE | ClockMan.EXE | ColdMan.EXE | DarkMan.EXE | HeatMan.EXE | JapanMan.EXE | LarkMan.EXE | MistMan.EXE | Serenade.EXE | SparkMan.EXE | VideoMan.EXE

Mega Man Star Force

Cepheus | Gemini | Taurus | Cygnus | Libra | Cancer | Andromeda | Crown | Ophiuca | Wolf | Patrick Sprigs | Jammers

Murian Empire
Dr. Vega | Hyde | Rich Dotcom | Gerry Romero | Shaman | Hollow | Solo | Condor | Plesio | Le Mu | Laplace

Mr. King | Joker | Queen Tia | Jack | Virgo | Corvus | Omega-Xis Copy

Apollo Flame | Chrys Golds | Diamond Ice | Dread Joker R | General Auriga | Harp Note IF | Sirius


Constellation Droids | Dimensions | Dr. Wily (Mega Man TV Series) | Proto Man (Mega Man 1994 Cartoon) | R-Shadow | Robosaur Park Dinosaurs | Slur

           Capcom logo.png Vs. Whatever Villains

Capcom Universe
Abyss | Akuma | Albert Wesker | Anakaris | Astaroth | Baby Bonnie Hood | Balrog | Black Hayato | Demitri Maximoff | Devilotte | Dr. Wily | Evil Ryu | Firebrand | Grandmaster Meio (Original) | Hugo | Huitzil | Jedah Dohma | Juri Han | Lilith Aensland | Lord Raptor | M. Bison | Megaman Juno | Nemesis | Pyron | Red Arremers | Rolento | Sagat | Seth | Shadow | Shadow Lady | Sigma | Solo | Strider Hien | Trish | Tong Pooh | Urien | Vector | Vega | Vergil | Vile | Yami | Zangief

Marvel Universe
Apocalypse | Blackheart | Black Widow | Dark Phoenix | Deadpool | Doctor Doom | Dormammu | Galactus | Juggernaut | Lady Death | Magneto | Marrow | Mephisto | M.O.D.O.K. | Omega Red | Onslaught | Sabretooth | Sentinels | Shuma-Gorath | Silver Samurai | Spiral | Taskmaster | Thanos | Ultron | Winter Soldier

Sega Universe
Dr. Eggman | E-123 Omega | Goro Majima | Metal Sonic | Reala | Rouge the Bat | Shadow the Hedgehog | Wizeman

SNK Universe
Geese Howard | Iori Yagami | Rugal Bernstein | Ryuji Yamazaki

Namco Universe
Ancient Ogre | Heihachi Mishima | Jin Kazama | Kazuya Mishima | Saya | Sheath

Tatsunoko Universe
Berg Katse | Boyacky | Doronjo | Tonzura | Sosai X

Original Generation
Ultron Sigma