For those that like to make character-only campaigns, I found all of the -char command lines.
Here's the list, along with the names.
8-Bit Meat Boy
4-Color Meat Boy
4-Bit Meat Boy
Meat Boy + Bandage Girl
There you go. Have fun.
Just so you know, you need -devmode enabled to do this, this own't get you easy access to other characters in regular mode. Just get the bandages if you really want the characters, bro.