He's constantly talking to himself , but hes not sure if the strange voice he's always hearing is actually his own, or maybe someone else. .
He loves books, in fact he learned the human language and expressions by the ones he has found over time, his way of speaking is  actually quite elegant and mature.
although his age cannot be confirmed , he sounds very young , in fact it can be said that he's like a teenager (could be like 16-17) looking at his human features.