Well, Sagus, I have to say I am very impressed.
First, the appearance? Creepy as hell at first, not that bad after a few seconds. (Just as ghosts should be, in my opinion)
Based on her powers and appearance, I had a rather heavy ''dafuq'' moment when I read her personality and, after reading her biography, realized it couldn't make more sense.
The biography is not only what you'd expect of a traditional japanese legend, but is also terribly realistic.
Her title and religious views are such perfect details, I can only applaud.
Your spells and spellcard being completed as well as every other aspects, you're the one who has the best progress in terms of character creation, even including myself.