The White Spy (official name Dagger) is one of the main characters in the MAD comic: Spy vs. Spy. His enemy in the comic is the Black Spy. White Spy is virtually identical to Black Spy such as same overcoats and long pointed noses (similar to plague doctor outfits). The only difference between them is the color of their clothes: one dresses in white and the other in black. White Spy's real name is Dagger.
White Spy and Black Spy share an intense hatred for one another, since the entire race of White and Black Spies are at war. Although they're enemies for life, they do seem to have some aspect of respect for one another.
White Spy is deeply in love with Grey Spy, however, she uses this fact as an advantage in killing both White and Black Spy.