Princess Zelda plays a much larger role in Spirit Tracks than in previous installments, as she herself also aids Link in the salvation of Hyrule. Near the beginning of the game, Link travels to Hyrule Castle to see Zelda and become an official train conductor. Because he is an engineer and the apprentice of Alfonzo, who was once the head of the castle guard, Zelda asks Link to secretly meet her in her quarters later to discuss something with him. Zelda explains to Link that she needs to get to the Tower of Spirits to personally investigate the disappearance of the Spirit Tracks, which she attributes to something that Chancellor Cole is hiding.
Princess Zelda returns as a playable character in the fifth installment of Super Smash Bros. Her appearance is now based on her design from A Link Between Worlds, since Masahiro Sakurai and the developers felt her Breath of the Wild incarnation was more suited to research than combat. In the Japanese trailer, however, it lists the basis of her appearance as being Triforce of the Gods, or A Link to the Past. Her move set is largely the same as previous games with some adjustments. However, Zelda's Final Smash has changed from the Light Arrow to the Triforce of Wisdom, which will trap opponents inside the titular Triforce piece for huge damage.
According to the in-game backstories, the world of Hyrule was created by the three golden goddesses: Din, Farore, and Nayru. Before departing, the goddesses left a sacred artifact called the Triforce, which could grant powers to the user. It physically manifests itself as three golden triangles in which each embodies one of the goddesses' virtues: Power, Courage, and Wisdom. However, because the Triforce has no will of its own and it could not judge between good and evil, it would grant any wish indiscriminately. Because of this, it was placed within an alternate world called the "Sacred Realm" or the "Golden Land" until one worthy of its power and has balanced virtues of Power, Wisdom, and Courage in their heart could obtain it, in its entirety. If a person is not of a balanced heart, the triforce part that the user mostly believes in will stay with that person and the remainder will seek out others. In order to master and control the triforce as a whole, the user must get the other parts found in other individuals and bring them together to reunite them. The Sacred Realm can itself be affected by the heart of those who enters it: those who are pure will make it a paradise, while those who are evil will transform it into a dark realm.