Gunpei Yokoi is forever my favourite developer. Definitely not the "best" - that's clearly Miyamoto. But above my love for Zelda and Mario is my love for the DS. I've spent more time playing my DS than I even did my N64, when I was a kid.
Yes, the DS came out far after Yokoi's death. But the DS never would've come to fruition without Yokoi's genius. Yokoi did create the Game & Watch, particularly the dual-screened Donkey Kong G&W. And he did create the Gameboy.
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