Reddit reviews For Love of Evil (Book Six of Incarnations of Immortality)

The Incarnations of Immortality series by Piers Anthony.

Its 7 books, the first one being "On a Pale Horse."

The story is set in a not-so-distant future kind of world (only slightly more advanced technology than us) that has also incorporated magic and mixed magic and science together. There are seven Incarnations: Death, Time, Fate, War, Nature, Good, and Evil. The Incarnations are actually "offices" held by people who were once human but who, upon taking office, gained temporary immortality and special powers along with their office.

By far the first book ("On a Pale Horse" which deals with the Incarnation of Death who is actually a really nice guy) and the 6th book ("For Love of Evil" which deals with the Incarnation of Evil who even more surprisingly started out as a VERY nice guy!) are the best books in the series. I read them as a teen but they were my brother's copies and he took them when he moved out. I was lucky enough recently to find 6 of them at a cheap book sale for 50 cents each, except for book 6 (my favorite!) and so book six is on my wishlist.

This series is so cool and so intriguing, I guarantee if you read book 1 you will be hooked. The nice thing is that the books are not too long and they read easily and they all work in plot details together to weave one giant story of many Incarnations' lives.

Edit: Here is a link to the first book!