Like the title implies I'm looking for information on any adventure game any of you foke might know of that uses a blind protagonist or support character. My search hasn't produced much so far, just (sound activates sight) ecolocation stuff like "pulse" and "Perception"
https://www.youtube.com/watch?v=iPL76K7w9yc
https://www.youtube.com/watch?v=L_1zUXv5l7M
Does anyone know of others? or has anyone had ideas/ dabbled with the concept at all?
There's this game, Blindside I keep meaning to check out. I'm not sure if it's exactly what you're on about but it's an audio game where you play as a blind person.
http://www.blindsidegame.com
Not blindness per se, but not being able to see in a dark room and gameplay reflecting this:
Wages of Darkness (https://www.adventuregamestudio.co.uk/site/games/game/1581/)
I made an hourgame called Witness! (https://www.adventuregamestudio.co.uk/site/games/game/785/) ages ago, that features a blind protagonist.
Be aware, though, it is an hourgame (i.e. made completely in 1 hour for a competition), so be sure to know what you're getting into (very low production values, very short game :D).
Beyond eyes fits your description very well I think:
http://www.beyondeyes-game.com/
In the game you can't see anything of the environment unless you touch it or there is sound.