"Quiet in character" typically refers to someone who is reserved, introspective, and tends to keep their thoughts and emotions to themselves. They may not be very outgoing or vocal, and prefer solitude or deep conversations with close friends.
A word that means quiet in character is "reserved."
Droopy .
Quiet.
quiet and gentle, kind, rather quiet.
A quiet character may have a more conservative hairstyle than a loud one. They may have little to no makeup, and have a worried or withdrawn expression. They may be gothic and wear lots of dark colored clothes. Think of people you have met in your life who are quiet, and use those elements to create a "quiet" character.
quiet, quaint, ...
The pune warrors
Quiet
be quiet
It means to be extremely quiet, and make little sound.
The sentence uses the positive degree of comparison, as it does not compare the character's speaking volume or intensity to any other level. It simply states that the audience became quiet when the character started talking.
Shy, quiet, gawky, youth