
Fiore is the wounded alien at the heart of Sailor Moon R: The Movie, a childhood companion of Mamoru who returns to Earth clutching the parasitic Xenian Flower. Loneliness and jealousy twist his devotion until Usagi's kindness finally reaches him.
Fiore moves between two guises. His natural state is that of an otherworldly alien, while during his brief stay in Tokyo he takes on a human appearance. His whole being is bound up with plant life, and flowers are the thing he treasures most.
At his core Fiore is defined by loneliness and a fierce, possessive attachment to Mamoru. His resentment of the closeness between Mamoru and Usagi festers into open hostility, driving him to turn his creatures against the Sailor Guardians. Yet the same intensity that fuels his jealousy is rooted in loyalty and a promise he refuses to break.
Born far outside the Solar System, Fiore drifted to Earth as a child and befriended Mamoru during the period after Mamoru had lost his parents. When it came time to part, Mamoru handed him a single red rose, and Fiore vowed to come back one day bearing many beautiful flowers. He then set off in search of a bloom worthy of his friend.
By the time he returns carrying the Xenian Flower, Mamoru has all but forgotten him. Usagi is dismayed by the sudden tension between the two, unsure why Mamoru never mentioned this figure from his past. Fiore's envy soon boils over, and he looses his Flower Youma to kill the Guardians, Sailor Moon above all. When he lunges to run Sailor Moon through with his extended claws, he strikes Tuxedo Mask by mistake and carries him off into space to heal.
In the end Sailor Moon reveals that the flower Mamoru cherishes is the very one Usagi gave him earlier that day. Moved, Fiore draws a bloom from his own life energy and offers it to Mamoru to revive Usagi, keeping the promise he made as a child.

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Fiore's bond with Mamoru in Sailor Moon R: The Movie is portrayed as an intense, possessive devotion rooted in their childhood friendship. He grows fiercely jealous whenever Usagi gets close to Mamoru, a jealousy that drives much of the film's conflict.
Fiore returns to Earth as an adult carrying the parasitic Xenian Flower, hoping to reunite with his childhood friend Mamoru. His jealousy over Usagi leads him to attack the Sailor Guardians, but Usagi's kindness ultimately reaches him and he uses his own life energy to revive her.
Fiore is an alien who drifted to Earth as a child and befriended Mamoru after Mamoru lost his parents. Before parting, Mamoru gave him a red rose, and Fiore vowed to return one day with beautiful flowers of his own.
The Xenian Flower is the parasitic bloom Fiore brings back to Earth as a gift for Mamoru. Its influence twists Fiore's loneliness and jealousy into hostility, leading him to unleash Flower Youma against the Sailor Guardians.
Sailor Moon reveals that the flower Mamoru cherishes most is the simple rose Usagi gave him earlier that day, moving Fiore deeply. He then draws a bloom from his own life energy and gives it to Mamoru to revive Usagi, finally keeping the promise he made as a child.
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