A deaf boy.
Born with over sensitive hearing, the young boy goes deaf in an accident, when a loud sound is just too loud and bursts his eardrums. From age 12, he has been deaf, and terribly misses the ability to see.
A mute boy.
Born with the inability to speak, the young boy has always found it difficult to communicate what he feels. He has ways to ‘speak’ texting, writing. But he always feels as if is unable to truly communicate.
I know this isn’t very developed, but it’s just an idea.