Can't decide out of this lot:
Science:
- Charles Darwin
- Albert Einstein
- Watson & Crick
- Archimedes
- Imhotep (Egyptian medic and architect, much of Hipocrates' teachings were based on Imhotep's, but Imhotep did it over 1000 yrs before)
Civilisations:
- Ramses II
- Genghis Khan (supposedly 1 in 10 people can trace their ancestry directly to this guy... frisky bugger)
- Alexander the Great
- Julius Caesar
Not sure about greatest but influential:
Religion:
- Jesus Christ
- Emperor Constantine
- Mohammed
- Buddha
And just for laughs:
Finctional:
- Gordon Freeman
- JC Denton
- Solid Snake
- Mario
- Link
- Master Chief
- Shepard
- Neo
- Emperor Palpatine
- Darth Revan








