You know, I've been wondering, with all these weapon arts that the Rangers are learning, will we ever get to see them again beyond their initial appearance and a couple of appearances after? If they keep learning new skills just to defeat the MOTW, and never use the skill again, I think it's pretty pointless.
So far, Kata has taught Rio despair and hatred, while Rageku is teaching him jealousy. What will the 3rd Kenma teach? I thought of anger, but then hatred seems to be more powerful than anger, so I wonder what negative emotion Rio will next learn.