Okay so I was reading on another board that you must beat all stages with all four characters to unlock NegaScott, and it must be done on the same profile. Also, when beating it, each one can be done separately. You don't have to beat it with all four characters at the same time. For those who have the Xbox Live version, is this correct?
 
Also, are there any other unlockable characters?

Apparently Knives Chau is the last character. You get her when you buy the movie, which is packaged with a download code. Which bums me out a bit.

you'll unlock knives chau by buying the movie? where did you get the info? that's awesome though lol!

Is this real??? I hope so!  I hated Knives at the beginning of the movie but she definately grew on me as she matured!! I hope it is a unlockable!!!! 
 
Has anyone got Mr. Chau?  My brother found him but lost to him.  Havent found him since..... :(

Yeah, what are the requirements for making Mr. Chau appear on the map? 
 
Also, why the fuck is the movie not screening until January in Europe? :(