Weapons: Knives, Dark Blades, Boomerangs
As with Thieves, note that Boomerangs include all items thrown to inflict damage (without actually using the Throw command). The Ninja is more or less a standard upgrade to the Thief. Instead of stealing, the Ninja will Throw items for massive damage. The item will be lost, but with items like Shuriken dealing enormous damage (9,999 kind of damage), it’s well worth it, at least on the final boss. In every other situation, the Ninja is bulkier, more powerful, and faster than the Thief, and still retains the key advantage of being able to stand in the back row and throw Boomerang class weapons. On top of that you can still use knives, and now you can even equip dark blades!
You should take advantage of being able to sit in the back row as often as you can, though. Ninjas, with their high speed, also have very high hit-counts to compensate for middling attack compared to other offensive job classes. 20 hits will become commonplace with the Ninja. The Ninja’s biggest weakness is its lack of magical defense . Make sure your Devout is on hand at all times.