It's a tie between Hideo Kojima for all the recent controversy leading up to the release of MGSV and beyond that has made his even more of a common name among gamers than ever before, and Phil Spencer for increasing his prominence and association with the Xbox brand through repeated interviews with major gaming media outlets, for better or for worse.
For those saying Miyamoto, recognize that outside of the Nintendo core, his name is not very relevant anymore. We're talking biggest today. As in at the end of 2015. Miyamoto just hasn't been all that relevant in the gaming world for awhile now outside of the core Nintendo audience. The mass appeal his games and otherwise once had is no longer a prominent feature of his current image, and undeniably others completely and utterly outshine him in terms of 2015 media coverage from both amateurs and major outlets alike.
