Souls

All living creatures, and some non-creatures, have some form of soul. Souls are the essence of a being, bearing that being's true name. They are generally immortal and are nearly indestructible.

Timeless Souls
Timeless souls exist outside of time. Thus while they technically have free will, they only ever make one moral choice, between Good and Evil, and are then committed to that choice, since they exist outside of time and therefore never change.
 * Celestials
 * Fiends (Devils and Demons)

Fully-willed Souls
These are the souls of most "people". While a species might have an instinctual/ancestral leaning (such as chromatic dragons for evil), each member of the species has the free will to make their own moral decisions.
 * Giants
 * Dragons
 * Elves (including Drow)
 * Dwarves (including Duergar)
 * Humans (including Tieflings)
 * Halflings
 * Gnomes (including Deep Gnomes)
 * Dragonborn
 * Half-Orcs

Half-willed Souls
These souls have some free will, but are mostly governed by their nature.
 * Orcs
 * Goblins

Natural Souls
These are the souls of creatures without free will. They generally fade away when a creature dies, but some can go on to an afterlife.
 * Animals
 * Plants

Spirits
These are most akin to timeless souls, but less powerful and generally neutral aligned. See Spirits.
 * Forests
 * Rivers
 * Mountains
 * Some cities

No Soul

 * Mindless undead (i.e. skeletons, zombies)
 * Constructs
 * Elementals

Unknown

 * Good
 * Powers
 * Elder Gods