- 3D-Man
- 8-Ball
- A-Bomb
- A.I.M.
- ADAMs
- Abby
- Abigail Brand
- Abigail Burns
- Abomination
- Abomination II (Chang Lam)
- Abominatrix
- Abu Bakar
- Adam-II
- Adam Warlock
- Adria (Witch)
- Adriana Soria
- Adversary
- Aero
- Agamemnon
- Agamotto
- Agent (Rick Mason)
- Agent 33
- Agent Venom
- Agent Zero
- Aggamon
- Agony
- Ahab
- Ahmad Korba (HYDRA Sheikh)
- Ai Apaec
- Ailana Kabua
- Ajax (Francis Freeman)
- Alaris
- Aleksander Lukin
- Alexander Pierce
- Alisha Whitley
- Alkhema
- All-Winners Squad
- Alpha Flight
- Alpha Primitives
- Alphonso Mackenzie
- Amatsu-Mikaboshi
- American Eagle
- American Son
- Ami
- Amphibion
- Anaconda
- Ancient One
- Andrea von Strucker
- Andreas Kapelos
- Andreas von Strucker
- Andrew Forson
- Android Man
- Andromeda
- Andros Stark
- Andy Strucker
- Angar the Screamer
- Angel (Thomas Halloway)
- Angela
- Angela Rose
- Ani-Men
- Annihilus
- Anole
- Answer
- Ant-Man
- Anti-Venom
- Anung-Ite
- Apocalypse
- April Fool
- Aquarian
- Aqueduct
- Arachne
- Arcade
- Archangel
- Arclight
- Ares
- Arkon
- Armadillo
- Arnim Zola
- Arno Stark
- Arnold Brown
- Arsenal
- Asbestos Man
- Asp
- Asti the All-Seeing
- Asylum
- Atlantis Empire
- Atlas Foundation
- Atom Smasher
- Atropos
- Att-Lass
- Atum
- Auran
- Aurora
- Avalanche
- Avengers
- Awesome Android
- Axl Nacht
- Ayesha
- Azazel
- BOVA
- Baby Bombshell
- Banshee
- Baron Blood
- Baron Heinrich Zemo
- Baron Karza
- Baron Mordo
- Baron Strucker
- Barracuda
- Basilisk
- Basqat
- Bastion
- Batroc
- Beast
- Beasts of Berlin
- Beetle
- Bella Donna
- Ben
- Beta Ray Bill
- Beyonder
- Bi-Beast
- Big Ben Donovan
- Big Man
- Big Wheel
- Binary
- Birthday Bandit
- Bishop
- Black Abbott
- Black Bolt
- Black Cat
- Black Crow
- Black Knight
- Black Knight I
- Black Mamba
- Black Marvel
- Black Ninja
- Black Panther
- Black Racer
- Black Spectre
- Black Talon
- Black Tarantula
- Black Tom Cassidy
- Black Widow
- Black Widow (Cara Douglas)
- Blackheart
- Blacklash
- Blackout
- Blackwing
- Blackwing II
- Blade
- Blastaar
- Blazing Skull
- Blink
- Blizzard
- Blob
- Blood Brothers
- Bloodhawk
- Bloodscream
- Bloodstorm One
- Blowtorch Brand
- Blue Diamond
- Blue Eagle
- Blue Marvel
- Blue Ninja
- Bluestreak
- Blur
- Bob, Agent of HYDRA
- Bobcat
- Bombshell
- Bombu
- Bone Spider
- Boomerang
- Boomslang
- Boris Monguski
- Bossman Morgan
- Bova
- Bowman
- Box
- Brain Drain (Werner Schmidt)
- Brawn
- Breeze Barton
- Bron-Char
- Brother Voodoo
- Brotherhood
- Brotherhood of the Shield
- Brothers Grimm
- Bruno Bucciarati
- Brutacus
- Brute
- Builders
- Bulldozer
- Bullet Biker
- Bullseye
- Bunsen Burners
- Bushmaster
- Bushwacker
- Cabal
- Cable
- Caiera
- Cannonball
- Captain America
- Captain Britain
- Captain Britain Corps
- Captain Manhattan
- Captain Ultra
- Captain Universe
- Captain Wings
- Capwolf
- Cardiac
- Cardinal
- Carlo Strange
- Carnage
- Carrion
- Century
- Challenger
- Chameleon
- Chance
- Changeling
- Charcoal
- Charles Xavier
- Cheetah
- Chemistro
- Chernabog
- Cheshire Cat
- Chitauri
- Chthon
- Claire Voyant
- Clay Quartermain
- Clea
- Cloak
- Coachwhip
- Cobalt Man
- Codename: BRAVO
- Colonel (Abdul Al-Rahman)
- Colonel John Ryker
- Colonel Yon-Rogg
- Colossus
- Comanche
- Comet Man
- Commander Kraken
- Conquistador
- Constrictor
- Controller
- Copperhead (Davis Lawfers)
- Copycat
- Corrupter
- Corvus Glaive
- Cottonmouth
- Count Nefaria
- Cowboy
- Cowled Commander
- Coyote
- Crawling Unknown
- Crime-Master
- Crimson Commando
- Crimson Dynamo
- Crippler
- Criti Noll
- Crossbones
- Crossbow
- Crossfire
- Crucible (Byron Calley)
- Crusader
- Crushtacean
- Crystal
- Cull Obsidian
- Cutthroat
- Cyber
- Cybertek Industries
- Cyclone
- Cyclops
- D.O.A.
- Daddy Longlegs
- Dagger
- Dagoth
- Daken
- Dakor the Magician
- Dakota North
- Damage
- Daniel Drumm
- Daniel Whitehall
- Dansen Macabre
- Dard'van
- Daredevil
- Dark
- Dark-Crawler
- Dark Avengers
- Darkhawk
- Darkoth
- Darkstar
- Dazzler
- Dead Ringer
- Deadpool
- Death
- Death's Head
- Death's Head (Paxton Page)
- Death-Stalker
- Death Adder
- Deathbird
- Deathlok
- Deathlok Prime
- Deathwatch
- Defenders
- Defenders (Alt. Version)
- Deltite
- Dementoid
- Demiurge
- Demogoblin
- Demolition Man
- Demon Spider
- Demonicus (Sorcerer)
- Destiny
- Destroyer (Enchanted Armor)
- Destroyer (Kevin Marklow)
- Devil Dinosaur
- Devil Hulk
- Devos the Devastator
- Diablo
- Diamondback
- Diamondback (Rachel Leighton)
- Digger (Roderick Krupp)
- Dire Wraiths
- Dirk Anger
- Discus
- Dismember
- Doc Century
- Doctor Bong
- Doctor Demonicus
- Doctor Doom
- Doctor Dorcas
- Doctor Druid
- Doctor Faustus
- Doctor Hydro
- Doctor Nemesis
- Doctor Spectrum
- Doctor Spectrum (Joseph ledger)
- Doctor Strange
- Doctor Time
- Domino
- Doombot
- Doombot (Avenger)
- Doorman
- Doppelganger
- Dorian Murdstone
- Doris
- Dormammu
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