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
