Hmmm, that's a tricky one. I can't think of any games like that at this moment...perhaps some others will help. I'm sorry about your friend, wish him the best.
King of Dragon Pass has voice over support. I have never played it with voice over support myself, but it's supposed to be good. This game is awesome. http://www.applevis.com/apps/ios/games/king-dragon-pass
I can't remember what it was called, but wasn't there a game that was played entirely using audio clues? I think the screen was just black, and you had to listen to footsteps and stuff to figure out where to go and what to do. It was a big deal on TA for a few weeks a couple years back I think...
That's the one, thanks! I googled it and found their website which says they removed it from the AppStore temporarily so they can redo the game engine and stuff. Also, they hint at a sequel. http://www.papasangre.com/ In whatever form, I suggest picking that up when it comes back. Very cool experience.