LOL! http://www.siliconera.com/2014/02/14/lightnings-story-truly-may-guest-future-final-fantasy/
For Lightning, her story ends here in Lightning Returns: Final Fantasy XIII, as this game is meant as a finale to this series. But we know that Lightning is an extremely popular character, even when compared to other Final Fantasy characters.
So there is a possibility that Lightning would appear in other future Final Fantasy titles, not as a protagonist, but as a guest character.
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