Handsome, evil and cold hearted.

Young Sephiroth: 18 year old, short silver hair and light green blue eyes, mature and quiet.

Villain Sephiroth: he wants rule the planet and rule humanity.

Crisis core Sephiroth: gentleman,nice and soft.

Sephiroth's remnants: Kadaj, silver short hair and light green eyes, evil and cold blooded. Yazoo, silver long middle hair and blue with a hint of green eyes, Loz, short hair, manly and strong and a bit emotional.

Back story: Sephiroth is A former soldier of the megacorporation Shinra and the coworker of Zack Fair and superior of Cloud Strife, he possesses superhuman physiology as a result of an experiment in which Shinra injected him with cells from the extraterrestrial lifeform Jenova when he was still a fetus.

Why he turned evil: Learning of his status as the greatest monster ever produced by Shinra and the knowledge of how his seeming race was betrayed was the last straw for Sephiroth and he finally falls into insanity, becoming extremely ruthless and destructive, falling from the greatest hero to the single greatest threat to the planet.