When you complete the following tasks to unlock the corresponding character in Free Roam mode.

Commander Video
Complete the Bit.Trip arcade game, and collect ALL gold.

Meat Boy
Complete the Meat Boy arcade game, and collect ALL bandages.

Mr. Destructoid
Defeat Dr. Von Buttnick at the Mr. Destructoid Robot Factory.

Ms. Bates
Defeat Ms. Bates.

Steve from Minecraft
Jump into the pipe in the Gated Community Zone.

Sweat Bomber
Complete the Sweat Bomber mini-game without giving up.

Face Skins
At MJ's Face-R-Us enter the following (case sensitive) coupon codes to unlock the corresponding character. Note: Press X to 'Enter Coupon Code'.

Anthony Carboni
Enter 'CARBONI'.

Destructoid Staff
Enter 'DTOID'.

Electric Playground TV Hosts
Enter 'ELECPLAY'.

Epic Meal Time
Enter 'EMT'.

Gaijin Staff
Enter 'GAIJIN'.

John Romero
Enter 'ROMERO'.

Maxime's friends
Enter 'MAXIMEAMIS'.

Mojang Staff
Enter 'MOJANG'.

Nintendo Power Staff
Enter 'POWER'.

Phil Guerrero
Enter 'PJFP'.

Playstation Blog Staff
Enter 'URNOTE'.

Polytron Staff
Enter 'POLYTRON'.

Team Meat Staff
Enter 'TEAMMEAT'.