Spirit

"Twilight covered Hyrule like a shroud, and without light, the people became as spirits. Within the twilight, they live on, unaware that they have passed into spirit forms... All the people know now is fear... Fear of a nameless evil..."

- Princess Zelda



Twilight Princess
During the events of Twilight Princess living inhabitants of Hyrule are transformed into spirits under the influence of the Twilight. Soldier spirits can be a glowing flame floating in the air, which are currently alive soldiers. In contrast, there are spirits (possibly not even spirits, just ghosts)in Hyrule Castle, which do not appear in Twilight and look undead. They have red, long hair, glowing eyes, and the same armor as their live counterparts. These are actually very helpful, because if wolf uses his senses, he will see them pointing to someplace. The pointing helps in making the right decision, right footing, and puzzle solving. Not all are transformed into spirits within the Twilight; it is believed that it's effects are partially negated by the protection of the Triforce. Ganondorf becomes a horned, yellow, glowing head, similar to a skull, as shown in a cutscene where Zant talks in the Palace of Twilight. Link becomes a wolf (strangely not transforming in the Palace of Twilight), whereas Princess Zelda remains in her true form. The Twili also remain in their true form due to them naturally inhabiting the Twilight Realm.

There are also Light Spirits. Their names all have a reference to the Golden Goddesses, Nayru, Din, and Farore. Ordona Farore, Faron] Farore, Lanayru Nayru, and Eldin Din.

Phantom Hourglass
In Phantom Hourglass, there are three spirits who are essential clues to finding the Ghost Ship and saving Tetra. The spirits are of Power, Wisdom, and Courage.