A list if you will:
Coconuts, Basketball, ladders, medical malpractice, the season of Winter, gambling debts, papercuts, auto-erotic asphyxiation, the loss of Party of Five, alcohol, peanuts, Robocop, the bottles of stuff you keep under the sink, school or work-related stress, Krang, too much TV, the search for more money, being gay during World War II, falling down the stairs, falling up the stairs, stray pianos, the comedy stylings of Will Ferrell, hunting accidents, getting within ten feet of Mike Tyson, mixing up your medication, lead paint, crossing the street, imitating things on TV that you're not supposed to try at home, being on the Titanic, being burned at the stake, the passage of time.
What do all these things have in common? They've all killed more people than Sephiroth. Final Fantasy VII is a terrible game. Stop your fanboying/fangirling now and for the love Square Enix stop naming your children Sephiroth.