Seriously? I may admit I do cheat on occasion (especially in GTAIV now that I have earned the 4 trophies that codes block) but this isn't a hard game to unlock everyone in. Just beat Story mode normally and you'd unlock everyone. Granted the last mission of 1TK Naruto and CS2 Sasuke is hard you just spam 1TK Naruto's OUgi and kill Sasuke in 2-3 hits easy. If you are still having problems go to options on the main menu and switch the difficulty to easy.
I beat story mode on easy and unlocked all the characters, so, I'm happy.
Yeah I know what you mean. Still if you want a 100% save since this game lacks trophies you can DL a save from GameFAQs. You just need a USB thumbdrive to transfer the save from your PC to PS3. That's what I did after I realized I'd never be able to get 100% on my own.