Persona: Sephiroth's personality is one of cold ruthlessness. Prior to his madness, he was not particularly anti-social, as he has friends in Crisis Core -Final Fantasy VII- and willingly tells Zack and Tifa about Mako and Materia on Mt. Nibel. All the same, his cold exterior and professional attitude turn people away.Sephiroth is the main antagonist of Final Fantasy VII, Final Fantasy VII Remake, and Final Fantasy VII Rebirth, and one of the major antagonists in its extended universe. In spin.