From wikipedia (not the best source on the web but this does some up the charector): Peter is an exaggerated stereotype of a boastful and careless boy. He claims greatness, even when such claims are questionable (such as congratulating himself when Wendy re-attaches his shadow). In the play and book, Peter symbolises the selfishness of childhood, and is portrayed as being forgetful and self-centred.
Peter has a nonchalant, devil-may-care attitude, and is fearlessly cocky when it comes to putting himself in danger.
Plus he enters kids homes with a fairie and tries to corrupt the kids. So, maybe this is not too far off.