So far (watch it be outdated by the time I post, lol):
Leaders:
Franklin Delano Roosevelt (I may change this to Elizabeth if all the rest are dudes)
Adolf Hitler (interesting first two choices, lol!)
Gandhi
Hannibal
Theodore Roosevelt
Augustus Caesar
Tamerlane
Tokugawa
Cincinnatus
Erwin Rommel
Genghis Khan
Napoleon Bonaparte
Alfred the Great
Artists: (by which I mean any and all artists, film, lit, music, painting, etc.)
William Shakespeare
The Beatles
J.R.R. Tolkien
Arnold Schoenberg
Vincent Van Gogh
Pablo Picasso
Henry David Thoreau (yeah, I think he's better here than Kant, bo_sox)
Claude Monet
Leonardo da Vinci
Lao Tzu
Pyotor Tchaikovsky
Vergil (here comes Team Vergil! lol)
Lord Byron
Fyodor Dostoyevsky
Michaelangelo
Wolfgang Amadeus Mozart (I APPROVE SO MUCH :D )
Scientists/Inventors:
Albert Einstein
Thomas Edison
Neil deGrasse Tyson
Jonas Salk
Robert Oppenheimer
Nikola Tesla
Werner von Braun
Mendeleev
Archimedes
James Joule
Aristotle
Isaac Newton
Wild Card: (the ones that aren't people's moms, footballers, octopi) ;)
Plato
Immanuel Kant
Rene Descartes
Benjamin Franklin
Gichin Funakoshi
Khalid ibn al-Walid
Martin Luther
John Locke
Benjamin L. Salomon...a dentist? Unless I don't know something about him besides that, is that really a world figure?
And before I include him, quick poll--should Jesus count or not (not for the religious aspect, but for the did-he-exist aspect.)