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Tifa Lockhart is a childhood friend of Cloud and a skilled martial artist, having been previously instructed by Zangan. She is one of the lead members of AVALANCHE and convinces Cloud to join them in their rebellion against Shinra. Tifa helps to unlock Cloud's missing memories, and is revealed to have a romantic interest in him. Tifa remains very important to Cloud and as time progresses Cloud's feelings remain ambiguous; letting players/viewers decide his final romantic love interest.

Source from Wikipeida