Lightning, her original name being Claire Farron (Eclair Farron (エクレール・ファロン, Ekurēru Faron?) in the Japanese version), is the main protagonist of Final Fantasy XIII. She is the narrator and a temporary playable character in Final Fantasy XIII-2, and returns as the protagonist and sole permanently playable character in Lightning Returns: Final Fantasy XIII. In current Mobius Final Fantasy x Final Fantasy XIII, Lightning appear as Ultimate Hero for ranger class, including Princess Sarah.(Wikia)
Cloud Strife is the main protagonist in Final Fantasy VII and Final Fantasy VII: Advent Children, and also appears in the spin-off games of the Compilation of Final Fantasy VII, including Dirge of Cerberus -Final Fantasy VII- and Crisis Core -Final Fantasy VII-, as a supporting character. He is to be the main character again for Final Fantasy VII Remake.