Thanks for the suggestion about adding special shurikens.

While this is definitely an interesting idea, the development team does not have any plans to introduce something like this. Since ninjas are able to boost their damage output through Daken, it would result in a direct damage boost on top of what katanas are already capable of. In the event that we were to introduce RMEA shurikens, we would have to lower the stats on katanas to balance everything properly, and we feel that this is not a desirable change.