Insidious Gaunt is a member of the well-known pureblood Gaunt family. He has decided to become a Dark Arts Professor after graduating Hogwarts due to his knack for successfully practicing the Dark Arts while attending Hogwarts. He is a very successful professor and is recognized all over the world for his Dark Arts knowledge. His favorite spell is Crucio, although he'd never use it on a student. He isn't a dark wizard though and is actually very charming and proper.