Kunai

Kunai, also known as Ninja Knife, Imperial, and Short Knife, is a recurring weapon in the series. It is often a low to mid-level Dagger with no special properties, though it can be used by several characters and Jobs most of the time.

Final Fantasy IV
Kunai, originally translated as Short, is a Katana that only Edge can equip, and is his starting weapon. It can be bought in Eblan Cave for 4000 Gil, has an attack of 25, and accuracy of 40.

Final Fantasy V
The Ninja Knife is a low-ranked Knife that can be used by nearly all job classes. It can be bought in Karnak and Lix, and has an attack of 26.

Final Fantasy VI
Kunai, originally called Imperial, is a low to mid-ranked Dagger and can only be used by Shadow, and is his starting weapon. More can be stolen from Baalzephon. It has an attack of 82.

Final Fantasy Tactics
The Kunai is the 2nd weakest Ninja Blade, with Ninja Blade being the weakest. It can be bought for 5000 Gil or poached from Ghouls, and has an attack of 9 and Defense of 5%

Final Fantasy Tactics Advance
The Ninja Knife is the 2nd weakest Katana in the game, with Zanmato being the weakest. It teaches Throw and has an attack of 31.

Final Fantasy Tactics A2: Grimoire of the Rift
Kunai is the weakest Katana in the game, and teaches the ability Throw. It has an attack power of 31.