The cool thing about rolling backpack styles is that the more you look around for them the more you will realize that they do make enough styles and colors for everybody.
If you look around you might see some batman, or even princess rolling backpacks. Perhaps you've seen a bunch and didn't realize it? You might ask how this could be, simple. When people aren't using them to roll you can put the wheels up, sometimes even with colvers and carry them on your back.
This makes them virtually the best backpacks you can get because they replace regular backpacks. So the question remains, why get a regular backpack when the rolling backpack can do the same exact thing??