Via patch, or 2 or what have you?
The ability to choose your created characters as the other members of your band that the computer is using when you are doing solo tour/bwt.
It really breaks up the feel of being in a band when you have a hillbilly looking guy on vocals, a punk ruck drummer, and a glam rock guy on guitar.
And then of course when you play again you get a totally different set of characters outside of the one you are playing with.
Kind of takes you out of the experience, and would be really cool to design the whole band IMO.