lol but REALY though, in REAL life, Kratos is FAR stronger then ALL of these characters. I'd say only Nariko or Dante would put up a great fight....the old Dante mind you.
I don't think you mean real life, but I get the idea. Like if in the Mario & Sonic Olympic Games games you didn't stand a chance in track events if you weren't Sonic and Shadow.
If the field wasn't leveled, I'd say Sackboy would dominate the other contenders if he had his create mode abilities. An infinite number of hazards for him to summon, the ability to lethalize the very ground you walk on, etc...
Then next would probably be Kratos, followed by the Coles (in addition to all his offensive abilities, his ability to siphon energy from any nearby power source to stay alive would be invaluable) and Raiden. Ratchet's RYNO would certainly rip several characters a new one (Especially the RYNO IV), and if Jak's Peacemaker was as powerful as his native games that would also be a force to be reckoned with.