This is not your typical ridiculously skinny half bird half woman. Ella the Harpy is more than meets the eye, and a very useful ally for demigods Percy, Hazel, and Frank.

What does she do? If an encyclopedia could take the form of a woman (or bird), it would be Ella. Any questions from Latin phrases to the definition of photosynthesis, she knows the answer.

Noteworthy: Don't let her tiny body fool you, she's got a massive appetite - just don't feed her cheese. Ella doesn't like cheese.