User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-4649443-20130607014423/@comment-3146930-20130607025903

This is going to sound a bit abstract, but Piper's flaw could be her inability to feel comfortable with herself. Aphrodite mentions in The Lost Hero that beauty is about finding the right fit. Yet Piper never feels like she is in the right place. She is a beautiful girl (as Jason mentioned countless times), but she constantly downplays how pretty she is or feels uncomfortable when she does dress nice. She has the ability to charmspeak, but sometimes has problems figuring out when it is and isn't ok to use it on people. She has constant doubts about her relationship with Jason. She just never seems to feel ok with things, finding that right "fit."