Leo and the Flame Princess

Piper McLean is a the kind of character I call a Mary Sue, and I hate her for it For those of 你 who don't know, a Mary Sue is a poorly written character (commonly found in bad fanfiction). This character is often female (a male version is a Gary Stu), and readers find her hard to believe.
Mary Sues are typically beautiful, to the point where 你 forget to breathe at the sight of her, and Piper is extremely beautiful. 'But she's supposed to be beautiful!' 你 say. 'She's the daughter of Aphrodite!' Yes, but in the PJO canon, daughters of Aphrodite are pretty much useless in battle, but not...