Shuriken: Used as distractions while escaping pursuers or going in for the kill.
Caltrops: Deter pursuers on foot. They also work on car tires!
Bladed tonfas are cool, but they sorta defeat the purpose of itself as a primarily "defensive" weapon. Plus, there are more techniques that require the user to grab the long arm and use that as blade catches. Can't do that with bladed tonfas.