So far we got a Katana, Wakizashi, Sai, Butterfly Knife, 3 stars...what else does it need???

Tetsu-bishi (caltrops)
Bokken (wooden practice sword)
Jitte (sai with only one tine)
Kama (short-handled sickle)
Kusari-gama (kama with a length of weighted chain)
Ninja-to (ninja sword, similar to katana, straight blade)
Tonfa (side-handle baton)