A quick guide detailing the original and easy methods of unlocking the hidden characters, where applicable.
—X-Men Children of the Atom—
Juggernaut
Scroll above Cyclops or below Colossus
Magneto
Scroll above Omega Red or below Silver Samurai
Akuma/Gouki
Highlight Spiral then wait two seconds. Press Left until you highlight Iceman. Wait two seconds, then press Right, Up, Right, Right, Down to highlight Silver Samurai. Wait two seconds then press HP + LK + HK.
Easy Select:
Scroll above Wolverine or below Psylocke
—Marvel Super Heroes—
Dr. Doom
Scroll above Wolverine or below Psylocke
Anita
Scroll above Spider-Man or below Captain America
Thanos
Scroll above Magneto or below Shuma-Gorath
–X-Men Vs. Street Fighter–
Akuma/Gouki
Scroll above any of the characters on the top row.
—Marvel Super Heroes Vs. Street Fighter—
U.S Agent
Hold Start, highlight M. Bison (Dictator), hold Up for at least five seconds, then press LP+HP or LK+HK
Easy Select:
Hold Start and select M. Bison
Shadow
Hold Start, highlight Dhalsim, hold Up for at least five seconds, then press LP+HP or LK+HK
Easy Select:
Hold Start and Select Dhalsim
Cyber Akuma/Mech Gouki
Note: Selecting Cyber Akuma/Mech Gouki will make you fight solo.
Armoured Spider-Man
Hold Start, move to Ryu, hold Down for at least five seconds, then press LP+HP or LK+HK
Easy Select: Hold Start and Select Spider-Man
Dark Sakura
Hold Start, move to Hulk, hold Right for at least five seconds, then press LP+HP or LK+HK
Easy Select:
Hold Start and select Hulk
Mecha Zangief
Hold Start, move to Blackheart, hold Left at least five seconds, then press LP+HP or LK+HK
Easy Select:
Hold Start and select Blackheart
Mephisto
Hold Start, move to Omega Red, hold Down at least five seconds, then press LP+HP or LK+HK
Easy Select:
Hold Start and select Omega Red
—Marvel Vs. Capcom: Clash of Super Heroes—
High Speed Venom (Orange)
Highlight Chun-Li and then press: Right, Down x4, Left, Up x4, Right x2, Down x2, Left x2, Down x2, Right x2, Up x4, Left x2, Up
Easy Select:
Scroll above Chun-Li
Hulk – Marvel Super Heroes Version (Orange)
Highlight Chun-Li and press: Right x2, Down x2, Left x2, Right x2, Down x2, Left x2, Up x4, Down x2, Right x2, Up x2, Down x4, Up x4, Left, Up.
Easy Select:
Scroll above Ryu
Hyper Armour War Machine (Gold)
Highlight Zangief and then press: Left x2, Down x2, Right x2, Down x2, Left x2, Up x4, Right x2, Left x2, Down x4, Right x2, Up x2, Left x2, Down x2, Right x2, Up x5
Easy Select:
Scroll above Zangief
Roll
Highlight Zangief, then press: Left x2, Down x2, Right x2, Down x2, Left x2, Up, Right, Up x2, Right x2
Easy Select:
Scroll to the right of Megaman
Shadow Lady
Highlight Morrigan and press: Up, Right x2, Down x4, Left x2, Up x4, Right x2, Left x2, Down x2, Right x2, Down x2, Left x2, Up x2, Right x2, Up x2, Left x2, Down x5
Easy Select:
Scroll below Gambit
Morrigan (Lilith)
Highlight Zangief, then press: Left x2, Down x2, Right x2, Up x2, Down x4, Left x2, Up x4, Right, Left, Down x4, Right x2, Up x4, Left x2, Down x4, Right, Down
Easy Select:
Scroll below War Machine
Credits
If there is the need for any corrections, make sure to comment below.