Ludivine

Ludivine is a young vampire lady who works as an assassin. Mainly targetting aristocratie. She often disguises herself as a man in order to be enrolled as a butler in fancy houselhold and get closer to her targets. She didn't think much of it at first but these missions are starting to awaken a gender identity crisis in her. 

Karton-kun AU
Basically a shojou AU. In this alternate universe Ludivine is a high school student crushing on BG-kun. She is also a member of the occult club