I am really looking forward to addressing this issue on AsCast today. Excellent point, Meto! I think this is a fandom issue, not a Pevensie issue. Just because we don't see them interacting with friends, does not mean they are not there. Going to Animus' point over on her LJ, the fact that fandom perceives them as lacking friends could be one reason for the prevalence of the intense brother bonding fics and the 'cest. There isn't room for anyone else. I think the perceived insularity is also fed by a fandom fear of writing compelling OCs when they may be perceived as Mary Sues.