Origin: Kingdom Hearts/ Final Fantasy Vll So far, Sephiroth is the only main antagonist from the Final Fantasy franchise to appear in the Kingdom Hearts series. He, along with Cloud, Tifa, Aerith, Yuffie, Zack, and Cid, originates from the Squaresoft game Final Fantasy VII, where he served as the main antagonist. Cloud considers Sephiroth a representation of his own inner darkness. Sephiroth is a mysterious swordsman with a connection to Cloud's past.