The parangu is basically a machete, a thin metal blade made of unfolded steel and used in a harsh chopping motion to clear underbrush and other vegetation out of the path for farming or making one's way through the wilderness. The parangu is popular aboard Mantis ships for cutting ropes or cloth without having to worry about protecting one's katana. Parangu are typically made of scrap metal and have a high chance of breaking in combat with a true blade.
The tonfa has its origin as the handle of a millstone. It consists of a wooden shaft roughly the length of a man's forearm, with a handle on the side that allows it to be held along the forearm. Held in this manner it is an effective defensive tool, but can also be spun as an offensive weapon.
An adapted threshing tool, the nunchaku is simple to build and surprisingly effective. It consists of two foot-long wooden handles connected by a foot-long length of chain. Nunchaku are a very poor weapon unless the wielder is skilled in their use, in which case their use is beautiful to watch and delivers a relentless flurry of bludgeoning strikes.
Even the Mantis Clan has not truly embraced the use of the kumade as a weapon. It is essentially a rake, consisting of a wooden handle with a sharpened metal tip at one end and a series of metal hooks at the other. The hooked end is used to pull stumps or weeds from the ground, while the spear- like end is used to prod or puncture objects in the way and then move them aside to be collected later. The generally flimsy construction of the kumade is the principal reason it has not been adopted for use as a weapon by the Yoritomo family.