Do you mean which human population is the most genetically diverse? Because as Andy said, an individual can't be diverse...well, unless he also contained DNA of a dead twin or something.
For diverse human populations, this is pretty cool:
http://news.softpedia.com/news/Natur...ks-48181.shtml - Apparently considered one of the most genetically diverse human populations.
In general, human populations in Africa have a greater genetic diversity than in other parts of the world, which makes sense based on the Recent African Origin theory of the origin of modern humans.
