User blog comment:Kraykan/Gol D. Roger: A Lame Face!/@comment-3060121-20101124015744

It relates him even more to Luffy, when Luffy is serious no one looks as string as he does but on a regular day he's just some funny looking kid. It gives the fans a way to kind of visualize a character that they are never really meant to see, if that makes any sense to you.