Also, two other things. One, there will be others like the man in white later. They're gonna be important, but it's up to you guys to figure out who they are.
Two, I forgot to mention one other type of character: Reapers. They're soldiers who specialize in hunting Deviants. if you choose to play one you'll get some sweet tech related gear.
I didn't mention them before cause in both times I've done this no one was interested in them XD