Mariana Grey. Nineteen and Caste three with the power to heal any injury... with the cost of having to take said injury. Let's say you have a cut on your hand, Mariana can take that but the cut will appear on her hand in the same place. It's extremely useful but can hurt her. Anyways, Introduce yourself!
I"m actually terrified that they might make this a movie because Hollywood would completely screw up the fact that this love triangle exists because each one loves the other. It's not really about Tessa choosing between Will and Jem.