Samurai Stuff
Samurai gear is something that would fit in well and look very cool. Standard samurai who wear the robes like image one, or the more heavily armored samurai like images two and three.
Kitsune Masks
Kitsune masks (Specifically some made seperate from that of Anbu masks) would be a very cool and fun concept to have. Plus once one model is made, the rest of the variants can just be texture swaps and changes.