These hidden items are unlocked when you have completed the indicated tasks in the game.

Unlock Concept Art 1 - Jadow Stars:
Complete V-Puzzle 7

Unlock Concept Art 2 - Jadow Villains:
Complete V-Puzzle 8

Unlock Concept Art 3 - Gedow Stars:
Complete V-Puzzle 9

Unlock Concept Art 4 - Gedow Villains:
Complete V-Puzzle 10

Unlock Concept Art 5 - Main Villains:
Complete V-Puzzle 11

Unlock Concept Art 6 - Main Stars:
Complete V-Puzzle 12

Unlock Last Battle Intro Movie:
Complete Les Acteurs Incroyable

Unlock Opening Movie:
Complete Riddle of the Incan Empire!

Unlock Ending Movie:
Complete Les Acteurs Incroyable

Complete the following tasks to unlock the corresponding hidden characters

Unlock Dark Fiend Charles the Third:
Participate in 30 multiplayer battles

Unlock Iron Ogre Hulk Davidson:
Participate in 50 multiplayer battles

Unlock Aquatic Terror Gran Bruce:
Participate in 70 multiplayer battles

Unlock Young Captain Blue:
Complete 'The Hidden Hideout' in Story mode

Unlock Rachel:
Complete 'Les Acteurs Incroyable' iIn Story mode

Unlock Fighter Bianky and Friends:
Complete 'Red Hot Rumble' in Story mode

Unlock Dark Hero Jet Black:
Complete 'Boss, Boss, Bang, Bang' in Story Mode

Unlock Young Blue Jr.:
Successfully beat Viewtiful Cartoon World - Special Edition

Unlock Heroine Silvia:
Successfully beat Truth of the Black Film - Special Edition

Unlock Manager Jet:
Successfully beat Gulliver's Battles - Special Edition

Unlock Sprocket:
Using any character complete any movie in Story mode

Unlock Charles the Third:
Using any 2 characters complete any movie(s) in Story mode

Unlock Hulk Davidson:
Using any 3 characters complete any movie(s) in Story mode

Unlock Gran Bruce:
Using any 4 characters complete any movie(s) in Story mode

Unlock Stylish Alastor:
In Story mode complete 'Riddle of the Incan Empire!' Special Edition

Unlock Director Blue:
Successfully beat Atlantis: Four Adventures of the Sea - Special Edition

Unlock Movie Fan Joe:
In Story mode complete 'Captain Blue Begins' Special Edition