Hey there Hari, I believe that I have a character who fits Beautifully into your [Vampire x Human in a non-fantasy world but with a splattering of stealthy Vampires going about their Vampire business.] idea. My vampire OC is a character who I may need to shift slightly, but as a base she hates what she is and already uses techniques to try and hide her nature anyway, so I do genuinely believe she would fit in perfectly with the mentioned idea.