Zig Zagged: A game series where some of the player characters of certain games in the series do not talk, while others do.
Averted: The player character talks, expositions and holds conversations on equal line with the rest of the characters.
"If we have the character say something the player doesn't want to say, it will make the game less immersive."
The creators of the game want to make the player character's line at the end a much greater surprise, and what better way to do that than by having the player character not talk for the rest of the game?
"You are a man of few words."
When asked if he ever talks, the hero just shrugs.
Conversed: "You ever notice how the main character in these types of games never talk?"
He is driven paranoid by the fact that one little mistake on his part can kill him and leave the Big Bad free to take over the world.
One part of the game sees the player character separated from the party and as such unable to talk to NPCs.
He doesn't talk because he feels his work is too important to waste time on trivial things like small talk.
The player character meets Alice, whose brother is also mute. She helps him find the rest of the party.
Plotted A Good Waste:
The protagonist doesn't know the language everyone else is speaking in, has an actual speech impediment, or is a robot who simply lacks the necessary hardware.
Or it's just to prevent the player character from saying something the player doesn't want to. Or the way the player character talks is through a separate microphone-type peripheral.
Played For Laughs:
The player character not only doesn't talk, but even when he's in serious pain. His mouth seems to be moving that signifies screams of agony but no sound at all.
The player characters tries to get everyone for attention, and the group ends up playing charades with him to communicate. Although one character may mention on why he doesn't simply write it down.
Played For Drama: A massive Player Punch occurs when there's an invasion going on and only the player character knows about. But because he cannot talk, and the group was too busy to read the stuff he wrote down (Or the game reveals he's illiterate). The Big Bad and his army rolled in and cause a Curb-Stomp Battle for the heroes. Later on, the survivors call theplayer character out for not warning them. One may even accuse that just because he doesn't talk, it makes him better that the rest of them.