Controlling two characters on two different screens in real-time is definitely a challenge, and while I don't find myself dying all too often, I am having quite a difficult time helping my partner on the top screen avoid damage.
While avoiding attacks with Neku on the bottom screen is fairly straightforward (you run away from danger and/or dodge with a skillful drag of the stylus), I have absolutely no idea how something similar can be done on the top screen. As far as I can tell so far (I haven't gotten too far in the game) my only means of controlling the top-screen character is by attacking with one of three different combos using the d-pad.
Is there any way to avoid damage on the top screen other than guessing which noise is about to attack next and dealing out a preemptive strike (a technique I don't consider overly reliable)? If that's my only option, how do I pick which noise to attack when there is more than one of them on either of my sides?