As the holder of the Triforce of Wisdom, she is wise beyond her years and intelligent enough to rule her people. She always wishes to do what is right for others and is extremely self-sacrificing. Though not always capable of defending herself or others on her own, she does not quit and tries to aid allies when she needs their help. She is also forgiving towards former enemies even when they have harmed her in someway. She is however, extremely loyal towards the ones she cares for (such as Link) and does not tolerate them getting harmed.
In The Minish Cap, Princess Zelda is known to sneak out of the castle to visit her good childhood friend, Link. At the beginning of the game, Link and Zelda head together towards the Picori Festival in Hyrule Castle Town. A catastrophe occurs when the evil wind mage, Vaati, appears and turns Zelda to stone, breaking the Picori Blade in the process. Link fuses the four elements to transform the blade into the Four Sword to reverse Vaati's spell. When Link saves Princess Zelda atop the roof of Hyrule Castle where she was being imprisoned by Vaati to steal the Light Force within her, she reveals to Link that she saw visions of him, as if in a dream. However, soon after this, the castle begins to collapse. As Link and Zelda head towards the Elemental Sanctuary, Vaati appears again and is subsequently defeated by Link. The Mage's Cap falls down and Ezlo, now a Minish again, urges Princess Zelda to make a wish. Princess Zelda thus wishes for Hyrule to return to its usual, peaceful state, making all the monsters disappear and returning its people back to normal.
Nintendo's 2011 timeline announcement subsequently posits that following Ocarina of Time, the timeline splits into three alternate routes: in one, Link fails to defeat Ganon, leading into the Imprisoning War and A Link to the Past, Oracle of Seasons and Oracle of Ages, Link's Awakening, The Legend of Zelda and The Adventure of Link. In the second and third, Link is successful, leading to a timeline split between his childhood (when Zelda sends him back in time so he can use the wisdom he has gained to warn the Zelda in the past of the horrifying fate of Hyrule) and adulthood (where the Zelda from the future lives on to try and rebuild the kingdom). His childhood continues with Majora's Mask, followed by Twilight Princess and Four Swords Adventures. The timeline from his adult life continues into Wind Waker, Phantom Hourglass and Spirit Tracks.
In The Wind Waker, when Link travels to Hyrule Castle beneath the Great Sea, there is a portrait of the Princess of Hyrule (around the age of Tetra) from before the Great Flood hanging on the wall of the castle. In the portrait, the princess is surrounded by several characters, all of which have a counterpart to a member of Tetra's Pirate Crew. It is known that during the Great Flood, she took a piece of the Triforce of Wisdom which had been broken in two by her father and fled to the mountaintops with several of her servants.
Generally Princess Zelda is adored by her subjects and meeting her is considered an honor among them. However, this admiration can occasionally get out of hand as shown in Ocarina of Time, where one of the Twins attempted to sneak into Hyrule Castle Garden to see the young Princess Zelda, but got stuck in the drain hole on the side of the castle on the way and was found by the Hyrulean Royal Guards. This caused security tighten as a result, making it more difficult for the young Hero of Time to sneak into the castle to meet Zelda.
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.