Clamp writer Nanase Ohkawa created Fuma knowing his fate as the Kamui of the Dragons of Earth, and her friends looked forward to the characterization.

The manga artists called Fuma's change from a kind guy to a mass murderer one of the strongest and darkest in their careers.

Fuma's new personality, his relationship with Kamui and their occasional clashes (most notably in the film directed by Rintaro) were cited as the series' most appealing aspects.

[1] Early in the series, Clamp head writer Nanase Ohkawa told her fellow artists about Fuma's future change into a villain.

Ohkawa applied to Kamui and Fuma ideas she had during middle school, such as a person's dual nature and how people can be considered good or evil.

In his early appearances Fuma was one of Clamp's worst silent characters according to the authors themselves as he barely had dialogue only when involving his sister and Kamui, making them to look forward to his transformation into a villain.

Artist Satsuki Igarashi found drawing the Dragons of Heaven and Earth at the same time difficult because of their individual clothing, which made her wish that they wore identical outfits.

[6] In Tsubasa: Reservoir Chronicle OVAs, Fuma is voiced by Yūji Kishi in Japanese and by Joel McDonald in English.

[10] Despite not showing any talent like the most prominent characters of the series, Fuma is able to pass the magical barriers created by Sorata Arisugawa much to his own surprise.

[20] Kamui later leaves Tokyo and becomes a delinquent; Fuma and Kotori's mother dies, creating the weapon known as Sacred Sword which Kyogo hides.

This automatically causes Fuma to be forced to become a Dragon of Earth, attacking Kamui and killing Kotori with new powers and the second Sacred Sword.

Kamui beheads him with his Sacred Sword near the end of the film; he weeps over Fuma's corpse and cradles his severed head, wondering why tragedy had befallen him.

[30] In addition to manga and anime, Fuma is a playable character in X: Unmei no Sentaku, a video games based on the series.

[35] Fuma appears in Japan Country to give Sakura's ally, Kurogane, a robotic arm while working for Yūko.

[39] Andy Hanley of UK Anime Network noted that an early scene in the series was a major foreshadowing event which would connect Fuma with Kamui, though initially irrelevant for the enjoyment of the narrative.

[43] Jason Thompson found Fuma's transformation one of Clamp's most famous plot twists, similar to those in RG Veda and Tokyo Babylon.

[45] Crispin Freeman was praised by Anime News Network as one of the best X English voice actors, as appealing as Junichi Suwabe.

[46] In the book Understanding Manga and Anime, Robin E. Brenner said that Clamp had no such intention in a comparison with the more-explicit relationship between Subaru and Seishiro.

[47] In a retrospective of the anime X, Beverdige praised Kamui's and Fuma's relationship; although the rest of the cast is amazing, few would make the audience overlook the conflict between the two main characters.

[49][50] Chris Beveridge of Mania Entertainment praised Kamui and Fuma's final fight in the television series, with its "own level of epic sadness and tragedy.