Azrael360: He (and his team) barely had anything to do with the Castlevania reboot. Sure, Kojima gave some of his ideas to the team of MercurySteam, but MercurySteam revelead that they only met him once for a few minutes and the final work is mostly 100% MercurySteam's (including the game engine).
I read about this a while ago in an Spanish publication. But all this was later translated into English when some developers from MercurySteam were accusing the (new) director of Lords Of Shadow 2 as an "irrational dictator". A very unfortunated incident very well known after that game was released, were many Spanish developers talked about their working relationship with the new director as "miserable". Kojima again had nothing to do with the sequel. Konami used only his name because that way the games would sell more (obviously).
Yeah, I heard Kojima mostly just influenced the aesthetics of the game, but I thought he was a little more involved than that. I just looked up an article about the director of the sequels, that's a shame, too. I've just started to play those, so I'm hoping I'm not disappointed.