Leonidas Van Rook was a rival cryptozoologist, mercenary and ally of V.V. Argost, as well as the tertiary antagonist for the first half of the series. Van Rook was solely interested in proving the existence of cryptids for money. He had built a reputation for himself which allows him to command large fees from those that hire him. Van Rook was an exceptional marksman, being able to shoot small quick moving objects out of the air. He had a tattoo on his right bicep of a snake wrapped around a skull.