I don't know if this has been posted before, since I haven't been able to track anything down, but a suggestion for adding in a Thief Job (not starter class) would be:

Gladiator: lvl 30
Pugilist: lvl 15

Since the gladiator already uses daggers, it stands to reason to use it as the basis for a Thief Job. Now for the Job itself, it would use certain skills from gladiator, save for any of the aggro producing skills. Replace those with skills that either transfer aggro onto the tank, or make their aggro dwindle. I'm no programmer, so I can't say how hard this would be, but it could be a basis to start somewhere for a Thief Job.

As for the Ninja, you could use the combination of:

Pugilist: 30
Archer: 15

using the monks natural two handed features to dual wield kunai or a katana/wakizashi set that is equip-able in a single weapon slot, like the monks/pugilists fist weapons.

What does everyone think? Also, don't know if this is in the right forum or not.