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Apart from what has been suggested,
Monster. You don't really get any of the main characters till the end. And its a really awesome series anyway so just watch it.
Jigoku Shoujo. Kinda fits your description. And is a must watch.
Kara No Kyokai. Movie series but its kickass and Shiki is far too awesome to miss.
I will post more if I remember. But these three should keep you busy for a while. That said, C.C. is hardly mysterious...
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