Shell Overlord

Biography
Shell, around other teachers, seems to be carefree and super hyper. He's cheerful and freaks out over the tiniest things. He's easily excited and practically fangirls over being around other people. Around students, his demeanor and attitude changes and he becomes more strict and far more presentable. His favorite students are Muggles.

Personality
Different undergound territories are marked by different vampires. Shell, heir to the Scottlands Throne, dislikes feeding off humans. He does it if there's consent, and even then, not many people are willing to lose a pint of blood in one go. Given Hogwarts' secrecy and intel, he's applying to keep a closer watch on the inside of the facilities.

Shell, as well, is known as an abnormal, but not to many. He keeps it a secret mostly as that would make him a literal laughing stock. Shell is an abnormal vampire for his interest in humans... as well as being underneath them and paid attention to by them.

AND NO, if you are bitten by a vampire, you don't become one.