Jinmu

Jinmu is an older, grouchy, old-school Vampire Hunter and shares the standard perspective with hunters that vampires are not to be trusted. He first appears when Yuuki and Zero went to the Hunters' Association headquarters. Jinmu quickly deduces that Zero has been tamed by Yuuki, and voices his reluctance to accept Zero as a comrade since he has been turned into a vampire. His loyalty remains with the Association rather than the individuals in the same field duty as he is.

(Source: Vampire Knight Wiki)