R4. I cannot think of any two characters placed in succession that has likely given Nintendo more headaches than those two. In the height of the Nintendo DS era, they were reportedly so common and easy to find in Japan that people could find them at corner electronics stores. The laws were changed so that this is no longer the case, but their impact on the Nintendo DS, both the market (financial and otherwise), and the legacy, is hard to overstate. Nevertheless, they live in a legal gray area that often leads to shutdown orders or copyright infringement.