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Magic: Though sworn off magic, Fay is able to sense magic passively, such as detecting barriers. For example, he detects the source of power in the castle in Hanshin, and in the Central Library of Rekord. He is also able to detect magic within people, so he knew the Syaoran he met at Yūko’s shop was a clone and that Seishiro also possessed magical powers. Fay writes off these instances of detection as ‘intuition’ and common knowledge for anyone with a basic understanding of magic.

In addition to various forms of offensive magic, Fay has aptitude with seals, having sealed Ashura under-water at the beginning of the series. Additionally, Fay is able to create protective barriers by whistling, as demonstrated in the group's escape from Tokyo. He is also able to teleport to dimensions on his own, though for most of the series, he pretends that he could only do so once. Fay has also used magic to magically seal Kurogane's sword Souhi into his left hand, saying that if Mokona is not around or if they are separated, he could take it out of his hand in the same fashion as the real Syaoran.

Fay's magic is powerful enough to slow his aging process; however, according to his behaviour there are no reasons to suggest that Fay is much older than he looks. He was supposed to die if he were to lose all his magic as his life itself depends on it but later he was spared from this effect due to vampire blood.

History:

When Fay's past is finally revealed, as his real name is Yuui. It is shown that "Yuui" was born in Valeria Country, with a twin named Fay. Though the birth of the second prince's son was highly anticipated, the birth of twins was considered to be a bad omen. Shortly after their birth, the second prince died, and their mother committed suicide out of guilt for giving birth to them. In addition, the country suffered many misfortunes, and the twins, when combined, bore powerful magic that rivaled that of the current king.

The king decided that making them unhappy was the only way to break the "curse", and since each refused to kill the other, they were locked up separately in a place where magic is ineffective and time does not flow: a tower residing in a deep valley. Fay was imprisoned atop the tower, and Yuui was confined at the base of the tower. Both were condemned to stay there "until the world's destruction."

Despite their unhappiness, the number of bodies dumped into the base of the tower began to grow. Yuui tried endlessly to climb up towards Fay, so they could escape, but he did not succeed. Eventually, the king became insane, and he executed every person in the country, except for Yuui and Fay. He then jumped into the valley himself and committing suicide in front of a horrified Yuui, reminding him that their birth was the reason for the country's misfortune, and that they would now "pay for that sin" by being the only people alive in Valeria.

Eventually, Fei Wang Reed appeared from another world, and offered to free one of them. Fay chose to save Yuui, resulting in Fay being thrown from the tower to his death. Fei Wang then tampered with Yuui's memory to make him think that Yuui had chosen to save himself at the cost of his brother's life, allowing Fei Wang to use Yuui's guilt in order to turn him into his servant. In order to bring his twin back to life, Yuui allowed Fei Wang to bestow two curses upon him, one of which was removed from Yuui's memory. Fei Wang then told Yuui that someone would free him from the valley, and that he would have to go on a journey, protecting "a princess" (Sakura), and killing any obstacles along the way. Fei Wang then tells Yuui that when he finds a magical feather, he should put it into Fay's body to prevent it from rotting, and that he should begin his journey when he finds a second feather, which he should give to Sakura.

Later, King Ashura came to Valeria from another world in order to retrieve Yuui and took him to Celes. When Ashura asked what Yuuy's name was, Yuui said it was "Fay". Ashura later gave Fay the last name "Flourite", the name of a precious talisman mineral, and he eventually earned the title 'D', given to the highest magician in Celes. And thus, Yuui became the protagonist "Fay D. Flourite". He found his two feathers while helping villagers during an avalanche, and decided to use one to create a person in his mother's image; Chii.

Ashura eventually tutored Fay in magic and comforted him whenever he felt unable to overcome his dark past. When Fay discovered that he could only learn "magic that kills people", Ashura told him that his smile held the ability to heal others. In exchange for everything that he had done for him, Ashura asked Fay to promise that he would eliminate anyone who threatened Celes.

Due to Fay's first curse, Ashura traced a magical seal on Fay's body in the form of a Phoenix tattoo, which suppressed his powers from growing any further, and though Fay protested, Ashura told him that Fay's first curse would break after it was fulfilled once, and he wanted to be the one that Fay would kill. Ashura then erased what he had told him from Fay's memory.

Several years later, a mysterious and deadly monster began to kill Celes's innocent civilians. Fay swore to defeat the beast, but found out that Ashura was the monster. Fay, at first, blamed himself for what happened to Ashura, thinking that "the curse of the twins" was what had caused Ashura to kill, but Ashura told him that his magic grows when he kills, and that he always knew that he would become a murderer, even though he was not sure why. Fay realized that Ashura had brought him under his care for the sole purpose of killing him when he reached this state. Unable to bring himself to kill Ashura, Fay cast a spell on him, putting him into a deep sleep. However, no magic spell was permanent, so the king would eventually awaken. In order to avoid having to face Ashura when he woke, Fay used his magic to teleport himself to the Dimensional Witch, where he began his journey.

Syaoran reveals that Fay's past may have been changed after Syaoran created the distortion due to his turning back time, and that Fay might have been born originally without a twin