This character speak without using his voice (because he is mute, suffering from a curse or fictional disease specific to the universe of the VN or other) but uses other means ("physical" and / or technological, not "supernatural" things like telepathy) to communicate with other characters (writting on their phone, writting on a sheet, using a voice synthesizer or other).
This trait is not absolute, it's not because he wears this trait that he doesn't speak at all. He may well be able to speak at some point in the VN.
To not confuse with
Ventriloquism.
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I thought of approving the trait, but noticed there are only a handful of characters using the
sign language. How many can there be that use other listed communication methods? I you can scrounge a handful of characters for that, I might approve the trait.