3-D Man
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)
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 (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 (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-Tronics
Asylum
Atlas (Team)
Aurora
Avalanche
Avengers
Avengers (Ultimate)
Azazel (Mutant)
Banshee
Banshee (Theresa Rourke)
Baron Strucker
Baron Zemo (Heinrich Zemo)
Baron Zemo (Helmut Zemo)
Baroness S'Bak
Barracuda
Bart Rozum
Bastion
Batroc the Leaper
Battering Ram
Beak
Beast
Beast (Earth-311)
Beast (Ultimate)
Becatron
Bedlam
Beef
Beetle (Abner Jenkins)
Ben Grimm
