Author Stephen R. Donaldson - INFP.
Thomas Covenant (anti-hero) - INFP with strong Si tertiary. Phobic 6w5. Tritype 6-1-4 (questioner - self-disciplinarian - artist). The 6-1-4 is known as the Philosopher, and Covenant is interested in such "fundamental" ethical questions as, "Do one's actions in dreams have any real [viz, 'ethical'] significance?"
Linden Avery - Healer, empath. She is a "damaged" type 4w5 who euthanized her own cancer-stricken mother and watched helplessly as her father committed slow suicide. INFJ.
Lord Foul - ENTJ. His approach to villainy is to send (and/or manipulate) others to do his bidding, but also to affect entire systems until the system itself is destroyed, whether that consists of breaking down someone psychologically or slowly disrupting the inherent system of Laws which governs the Land itself. 8w7, tritype 8-7-3.
Ravers (various names) - They seem to embody, in a disembodied way, the evil side of the type 3.