If you're going with first-person, there's cheap ways you could specify who's narrating. You could label the beginning of each chapter with who's speaking, like, "Chapter 1: The Beggining: Bob." Or something, depending on how creative you want to get with the font and placement.
Some people try to give every perspective a unique tone of voice, like a verbal tic or a stylized way of speaking. I don't suggest that, mostly because the reader could forget who says what and how, and it makes for a really rough beginning.
I'm pretty sure the concept of Law having limits was a translation error. -Wanderlustwarrior