Raiden Ei is an Immortal being that has been on earth for roughly four hundred years, she is described as a strict and stoic kind of person due to her immortality. She always hides the fact that she is immortal, as much as she hides the fact that she is four hundred years old. She doesn't shed any tears due to her tears already run out instead she sheds blood when she is crying. She's stoic to pretty much everything as she has seen it all, from the death of her first lover to now