I can easily see my health in the red at the top of the screen, and for the entire length of Chapter 1 I thought the blue was my partner's health. Turns out that's my mana (oops). So is there any way I can see my partner's health at the time, so I know if he's about to die or not? Would be good to know, so I don't go off doing risky things that could get me killed when my partner is about to die as well...
Just press select or back button then go to the abilities screen. You can switch characters by pressing X or square, and you can also see character info like life and mana.