Not Nice Code, but by far my favourite title on this thing is Luigi and Christ
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That is bananas. Does that mean there's no way to get it in the US version?
This has a "rudimentary Metroidvania" feel to it, as you play a transforming robot exploring a maze. Square did the NES port, but doesn't seem to have otherwise really been involved in the creation of this. I'm not good enough at it to really explore, but I'm tempted to try it on a platform where I can use cheat codes and see the sights.
Regular old Riki in the game (named "Max" in the FC version) is just some generic caveman guy, but you pick up a power-up which actually transforms you into Riki Choshu. The manual has a very good illustration of this process:
It says when you get the power-up, you can attack with a "Riki Lariat Bunshin."