I actually really like Emma Stone, but being a redhead (or at least often-dyed-red-head) with a crazy gleam in her eye, she'd do a good job as the psychotically deadly Krystal who joins Thanatos in book 2 (Underworld's Daughter).
Natalie Portman, does that ring a bell ? The one that played princess laia in tha Star Wars movie, the protagonist of the Black Swan movie or . if you're not such a know it all on movies its the girl that does the Dior adverts
Emma Stone - Emily Jean Emma Stone is an American actress best known for her deadpan acting style, husky voice, and red hair. Having been born in Arizona she dropped out of high school at age 15 to move to Hollywood and pursue acting.