Luchino B. Campanella

The head of the group of assassins known as the Mask Makers, Luchino is a stage magician who boards the Exit under the cover of a performer. However, he dislikes the feeling of killing, to the point of physical sickness (usually manifested in a great deal of vomiting). He wants to find Huey and demand answers from him as to why he killed one of Luchino's ancestors.

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It's revealed that Luchino is a descendant of Huey and Monica. At the end of Blood Sabbath, Elmer tells him who the true culprit behind Monica's death was.

(Source: TV Tropes)