Rima Tooya
One of the youngest night class students. She works as a model alongside Senri Shiki. Her exact relationship with Senri Shiki is unknown, though they are almost always seen together, signifying a close relationship. (Source: Wikipedia)
She is implied to have ended up with Shiki at the end of the manga.
Rima was the shortest night class student until Yuuki Kuran became her vampire form. Rima is only a cm taller than the Kuran Princess.