Larten Crepsley, also known as Mr. Crepsley, was the vampire who blooded Darren Shan in the Cirque Du Freak series. Consequently, he became the mentor to the Vampire Prince, Darren Shan forming a father-son bond between him and the young Prince. He was the deuteragonist of the Cirque Du Freak series and the main protagonist of the Saga of Larten Crepsley.