The on-screen "assist" and "special" buttons, used to call a teammate for a special attack or to launch one of your own special moves, can be "swiped" in four different directions, each one corresponding to a different attack.
While the virtual joystick works about as well as most, and I had a predictably difficult time playing the game, this is a smart adaptation that makes the on-screen interface somewhat more usable for a complex game. At least it shows thought toward usability on a touchscreen.
I realize I'm probably not exactly explaining this well, so I took screencaps of the help screens from the game. Swipe your way into our gallery to learn more.