In the same IGN interview where Hideo Kojima revealed The Phantom Pain will be the last of the Metal Gear Solid series, Kojima gave some details on Snake in TPP. One answer in-particular that was rather interesting is that Snake will barely talk. Among the idea behind Snake not talking as much, Hideo gives a little more insight on the game. You can check the interview above.
I’ve said it many times, but I understand why people feel Snake is cool and admire him, in realty, though, Snake is and always has been nothing more than an extension of the player. He’s your alter ego. Therefore, I made a very conscious effort this time to bring Snake closer to the player’s perspective. As much as possible, Snake will act based on the player rather than doing things like making spontaneous comments or flirting with women. In fact, this time, Snake won’t really speak much at all. Metal Gear Solid V: The Phantom Pain is an open world game focused on giving freedom to the player who will drive Snake’s actions. Snake himself will be more of a silent protagonist similar to Mad Max in Mad Max 2. It’s the characters around him who will expand the story.