The team doesn't have to win the WC, it could be Michael Essien who gets Ghana into the second round, and since it is his first WC (and for Ghana) he would be remembered for that IMO or he could be from Angola or Togo. You could also go Wayne Rooney, you get the point.
For me I will Francesco Totti, if he is fit enough and in form then he is clearly good enough to lead Italy all the way, and besides he has a lot to make up in the public eye after his sending off in 2002 and his spitting incident in Euro 2004 against Denmark. Totti in a way IMO is a bit under-rated in that he plays for Roma, who are not as big or illustratous as a Real Madrid, Barcelona, Juventus, both Milan clubs, Man U, Chelsea etc. so therefore he doesn't always gets the plaudits of a Ronaldinho, Zidane, Kaka, Gerrard, Ballack etc. and he has been a one-club man, having never left Roma (and I doubt he ever will) but there is no way he is inferior to Ronaldinho or Lampard so if he has a great tournament, even if Italy don't win I will be happy.
I will also go for Thierry Henry, for obvious reasons he needs a big tournament to exercise his demons from previous tournaments (where you could say he flopped in South Keora & Japan and then in Portugal two years later) and I see no reason why he can't do well, and if he does well I will be happy, not to get one over Scaly Piscine as other members will try and do (not naming names).