Balder
Banshee
Banshee (Theresa Rourke)
Baron Mordo (Karl Mordo)
Baron Strucker
Baron Zemo (Heinrich Zemo)
Baron Zemo (Helmut Zemo)
Baroness S'Bak
Barracuda
Bart Rozum
Bastion
Batroc the Leaper
Battering Ram
Battlestar
Beak
Beast
Beast (Earth-311)
Beast (Ultimate)
Becatron
Bedlam
Beef
Beetle (Abner Jenkins)
Belasco
Ben Grimm
Ben Parker
Ben Reilly
Ben Urich
Bengal
Beta-Ray Bill
Bethany Cabe
Betty Brant
Betty Ross
Beyonder
Bi-Beast
Big Bertha
Big Wheel
Bill Hollister
Bishop
Bishop (Ultimate)
Black Bird
Black Bolt
Black Bolt (Marvel War of Heroes)
Black Cat
Black Cat (Ultimate)
Black Crow
Black Knight (Dane Whitman)
Black Knight (Sir Percy of Scandia)
Black Panther
Black Panther (Shuri)
Black Panther (Ultimate)
Black Queen
Black Tarantula
Black Tom
Black Widow
Black Widow (LEGO Marvel Super Heroes)
Black Widow (Ultimate)
Black Widow (Yelena Belova)
Black Widow/Natasha Romanoff (MAA)
Blackheart
Blacklash
Blackout
Blade
Blastaar
Blazing Skull
Blindfold
Bling!
Blink
Blizzard
Blob
Blob (Ultimate)
Blockbuster
Blok
Bloke
Blonde Phantom
Bloodaxe
Bloodscream
Bloodstorm
Bloodstrike
Blue Blade
Blue Marvel
Blue Shield
Blur
Bob, Agent of Hydra
Boom Boom
Boomer
Boomerang
Box
Bride of Nine Spiders (Immortal Weapons)
Bromley
Brood
Brother Voodoo
Brotherhood of Evil Mutants
Brotherhood of Mutants (Ultimate)
Bruce Banner
Brute
Bucky
Bug
Bulldozer
Bullseye
Bushwacker
Butterfly
A-Bomb (HAS)
A.I.M.
Aaron Stack
Abomination (Emil Blonsky)
Abomination (Ultimate)
Absorbing Man
Abyss
Abyss (Age of Apocalypse)
Adam Destine
Adam Warlock
Aegis (Trey Rollins)
Aero (Aero)
Agatha Harkness
Agent Brand
Agent X (Nijo)
Agent Zero
Agents of Atlas
Aginar
Air-Walker (Gabriel Lan)
Ajak
Ajaxis
Akemi
Alain
Albert Cleary
Albion
Alex Power
Alex Wilder
Alexa Mendez
Alexander Pierce
Alice
Alicia Masters
Alpha Flight
Alpha Flight (Ultimate)
Alvin Maker
Amadeus Cho
Amanda Sefton
Amazoness
American Eagle (Jason Strongbow)
Amiko
Amora
Amphibian (Earth-712)
Amun
Ancient One
Ancient One (Ultimate)
Angel (Angel Salvadore)
Angel (Thomas Halloway)
Angel (Ultimate)
Angel (Warren Worthington III)
Angela (Aldrif Odinsdottir)
Anita Blake
Anne Marie Hoag
Annihilus
Anole
Ant-Man (Eric O'Grady)
Ant-Man (Hank Pym)
Ant-Man (Scott Lang)
Anthem
Apocalypse
Apocalypse (Ultimate)
Aqueduct
Arachne
Araña
Arcade
Arcana
Archangel
Arclight
Ares
Argent
Armadillo
Armor (Hisako Ichiki)
Armory
Arnim Zola
Arsenic
Artiee
Asgardian
Askew