Ok, I remember reading about this book or series of books, in which some concepts (such as Life, Death, Good, Evil etc) were real people. I know there were more concepts (7 I think...) and I don't know if those 4 listed ones were actually the concepts, although I know for sure death was one.
I know this is kind of vague, but any help would be awesome!
Or maybe that Piers Anthony series from the early 80s, Incarnations of Immortality, or something. There was 'On a Pale Horse' for Death, something or other for War, 'Green Mother' for Nature/Earth, etc, etc. I never did get around to finishing the series.
Borrowing from Wikipedia for the list to refresh my memory:
On a Pale Horse (1983) Death
Bearing an Hourglass (1984) Time
With a Tangled Skein (1985) Fate
Wielding a Red Sword (1986) War
Being a Green Mother (1987) Nature
For Love of Evil (1988) Evil
And Eternity (1990) Good
Under a Velvet Cloak (2007) Night
I believe I read the first three back in high school. Each book seemed to stand alone and I remember enjoying them, some more than others. I wasn't aware that Piers Anthony had returned to this series with the 8th and apparently final book.