If your character is part of a group where one of the bunch doesn't have much to say, there's a reason for it. Either a gentle giant or soft spoken, this side character (rarely a MC) carries a lot of mystery, an excellent plot ploy that will drive your audience nuts - in a good way.
The Quiet One - A character who doesn't speak much - but when they do, their words seem to have a greater impact over the others, even if it's nothing special.
Remember Zero from Holes (pictured above)? Winning example. He's named Zero because he doesn't talk. When he finally does, the table of boys freak out!
What makes this such a fun trope? Mind game manna! It gives characters either a soft side or an I'm-too-tough-to-bother-with-you vibe, making the other characters wonder what they're thinking, making the audience wonder what they're thinking. And there are real Quiet Ones, too. Maybe you knew one. Maybe you are one?
These characters have the uncanny ability to become the center of attention, even if they don't want it. I bet Silent Bob could say a few words about that. Or not.
Remember Mr. Edward? Odd looking duck, but his quiet, soft-spoken nature won the hearts of the community he entered, as well as the girl next door's. No matter what they look like, they seem to grab the ladies attention.
Well, most of the time.
(If the Quiet One's a girl, it often translates as "cute.")
Universally, when The Quiet One speaks, heads turn. Having been a Quiet One myself, I've seen the impact it makes. Nerve-racking and makes for great comedy!
Do you have a favorite Quiet One? Have you written one? Main character? Tender, traumatized, or tough?