Your paranormal beings for today are the Changling and the Chupacabra. The Changeling is a child who is not human that has been left in the place of a human child. The Chupacabra is a Mexican/South American legend that feeds on blood--usually the blood of cattle and other livestock. These two don't have much in common, and again I haven't hread any books with these creatures in them, but I have seen the movie, Changeling, with Angelina Jolie. (FYI: I'm a huge fan of Angelina Jolie and I think I've seen almost all her movies.)
I've got a big list of "C" books for you today!
Cargon: Duty and Sacrifice (Book 2) by Kimberly Gould
Cargon: Honour and Priviledge (Book 1) by Kimberly Gould
Carpe DiEmily by Riley J. Ford
Cerulean Dreams by Dan O'Brien
Chronicles of a Rock Troll: A Path of Justice by Jacob Donley
Chronicles of a Rock Troll: New Beginning by Jacob Donley
Czech Mate by Tom Immins
Here are some authors with a last name beginning with "C"
Becca J. Campbell
And me! Kayla Curry
Here are some character with first names that begin with "C"
Callista and Charles-The Forever Girl by Rebecca Hamilton
Charlie and Cooper-Revamp by Beck Sherman
Coral-After the Fear by Rosanne Rivers