In a harem fanfiction of Naruto and Final Fantasy 13, the story could start with Naruto being summoned by a powerful being in the FF13 world. The female characters there see him as a strange yet powerful ally. Lightning, for example, might be initially skeptical but gradually come to respect Naruto. Fang could be intrigued by his physical strength. As they interact more, a harem dynamic develops. Naruto's goal could be to find a way back home while also helping the FF13 characters with their fight against oppression. Along the way, romantic and comical situations can occur within the harem.
One plot idea could be that Naruto is somehow transported to the world of Final Fantasy 13. There, he meets the characters and due to his unique abilities and charm, a harem starts to form around him. He could use his ninja skills to help the characters in their battles against the fal'Cie. Another idea is that the characters from Final Fantasy 13 are brought to the Naruto world. The different cultures and powers collide, and as the FF13 characters adjust, they are drawn to Naruto, creating a harem situation. The harem members could then team up with Naruto to protect both worlds from common threats.
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