Anyways obviously it won't be like this in the full game ( at least I hope not )
I think thats done to match the color you choose. For example if you use parappa yellow color and someone does it too, you will be the yellow one and the other will maybe see you as the normal one, so you wont be the one who had to change. Of course only if you are able to pick your color in the full game.
I not sure if I explained it well xP