Quote Originally Posted by Skyblade View Post
MC's sex has nothing to do with the sales of the games. Heck, he could be a girl, just like Samus, and we'd never know it. He never talks or removes his armor, we only have other people's word for it.
Master Chief does talk, and the voice actor is Steve Downes. He is definitely male, this is written fact.
Quote Originally Posted by Wikipedia
Downes said that his voicing for Master Chief was based entirely on Bungie's written character description provided, which specified a character similar to Clint Eastwood and of few words.