Hmm... I'm still crafting my own thoughts on this but here's what I've come up with so far.
The body is the physical body you have.
The mind is your intelligence. It is what you think with.
The spirit is what is eternal and survives death. I'd peg Character as being a part of your spirit.
The soul is your template for who you are. It is what makes you unique from everyone else. (I.E. things like Talents, Personality, etc).
So far that's what I've come up with.