Catherine is the younger of the twins, and since she was small, she has always been rather timid. She loves to hear and write stories, and always has. However, horror stories about both obvious monsters and monsters who were men seriously frightened and scarred her. The only two men she really trusts completely are her father and older brother, and she is suspicious of all others.
When her brother left on his journey to tour the world, she was so distraught that her father hired a priest to come and calm her mind. After that, she noticed she could do certain things both to herself and to others with just a thought, but she kept her power hidden and mostly untrained. Because of this fear, her father reluctantly allowed her to learn to wield a rapier, if only to protect herself against the ever growing danger in London. She is not extraordinarily good, but she can hold her own enough until she finds the opportunity to run away which, thankfully, she has not had yet to do.
[more will be added and edited as other characters and their backgrounds are decided upon]