ken kutagari : father of the playstation, made a console popular and open the arms to third party.
Tetsuya nomura: character designer and director, make me cry ith FF7 -8- 10 KH, and likely do it again with 13 and versus.
the guy can do some caracters connection that are no where from be seen.
only tite kubo stand to him in my eyes.
Hideo Kojima: EVERY of his game it's perfect. his games are EPIC.
Fumito Ueda: Combine hideo and nomura you have fumito, ICO and shadow of the colossus are deep stories, yet simple characters that can still move you, and epic.
honorable mentions:
ted price - imsomniac games CEO, company that gave us spyro, resistance and rachet and clank, he also been involve against the censorship of video games.
yeah they all japanese, americans never have created a character in the ranks of sephiroth or ICO for me, they stories are written by american TV series writers, space marines, star trek, all characters are never memorable. IMO.