Add more canon lines, or make some up. 

Rachel is an artist. She's the daughter of a strict business man, and is constantly rebelling against his ideas. Even though she's a mortal, she is the host of the Oracle of Delphi. She's loud, outspoken, and isn't afraid to share her ideas with anyone who goes against hers. She's generally very nice, so don't worry about the mean streak she might have. She has the ability to see through the mist, even better than Sally Jackson.