Fai is a sorcerer from the country of Celes who escapes in order to request the witch Yuko Ichihara to travel to other worlds and never return to his homeland.

Despite his easygoing nature, Fai's true objective remains hidden which is further explored when the character is forced to return to his world alongside the group.

Critical reception to Fai's character has been positive based on his carefree nature and relationship he forms with the rest of the cast.

[3] Clamp's editor Kiichiro Sugawara was surprised by Fai's popularity as he ranked higher than Kurogane despite not being active fighter, something he found commonly praised by male readers.

However, it is strongly suggested that the King is losing his sanity as he locks the twins in a pocket dimension where they never age and the dead of the Kingdom literally pile up.

He uses one to create Chii (whom he apparently made to look like his departed mother), and the other is the feather Fai "found" in the first world the group travels to after meeting Yuuko.

[18] His powers are effectively halved when Syaoran consumes his left eye and is forced to become a vampire using Kamui's blood to save his life.

[21] Following Fei-Wang's death, he, Kurogane and Mokona decide to accompany the original Syaoran in a journey who is unable to stay in any dimension for a determined time.

In a general overview of the series Comics Worth Reading stated that Fai is "impossible not to like him immediately" based on his easygoing personality but felt that "he keeps his past and what is really going on inside him a secret.

"[26] Despite his initial fight sequences found appealing by Manga Life's Michael Aronson, the writer expected Fai's characterization would be further explored as he felt the main cast to be dull.

[27] Animefringe writer Lesley Smith enjoyed his calm scenes with Sakura and design made alongside Syaoran for a volume cover.

[29] Carl Kimlinger felt that the constant interactions between Fai and Kurogane appear to feel like shounen-ai despite the impact of such talks being lost.

[31] Fai was noted have hidden depths in the series but Carlos Santos from Anime News Network found that, by the 15th volume, Clamp still kept it in secret and hoped that the authors focused on it rather than doing multiple characters at the same time in Tokyo's arc.

[35] The same site kept noting that Fai's secret commentaries with Sakura were easy to notice by Kurogane and found that his character kept becoming far darker with most chapters as his origins were revealed and he was given a tragic fate due to his actions.

[37] Santos said the continuous foreshadowing of Fai's past starts delivering major twists in the story, including his sudden attack towards Sakura that would shock the readers.

[38] When Fai's background was fully revealed, Eries from the Fandom Post stated that this manga was filled with angst based how tragic was the character's childhood.

[39] For the ending, MangaNews lamented Kurogane and Fai were given a less prominent role as the narrative primarily focused on the clone characters.