Here's an example of what I'm talking about. At first, I thought it had something to do with the song being DLC, but when I purchased the song, their choreography didn't change. I looked at the options, but I can't find any option allowing me to change the back up dancers' choreography. It looks pretty cool, so I want to know how to do it for my own games.
you need a controller for this. first choose different difficulty then press ready for 2nd character and then press start with main character