Clone just the Fighter.
Most likely, the person making the clone is going to barely get that far before they realize just how much work it is and then come to the conclusion its easier to just play the regular game without bothering to clone it.
But if by some chance they actually get the Fighter fully cloned, then they can move onto the Rogue, then the Cleric, then the Wizard and so on. There's absolutely no reason to start worrying about what are classes 5 through 12 when you haven't even gotten classes 1 to 4 taken care of.
Most likely, the person making the clone is going to barely get that far before they realize just how much work it is and then come to the conclusion its easier to just play the regular game without bothering to clone it.
But if by some chance they actually get the Fighter fully cloned, then they can move onto the Rogue, then the Cleric, then the Wizard and so on. There's absolutely no reason to start worrying about what are classes 5 through 12 when you haven't even gotten classes 1 to 4 taken care of.