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Grelle Sutcliffe, Grell in the anime adaptation, is a flamboyant Grim Reaper who works as Madame Red's butler. He is initially portrayed as worthless and is often seen in the anime adaption trying to commit suicide after mishandling tasks. As a Grim Reaper, he is characterized with red hair and shark-like teeth. Grelle often refers to himself as a female and verbalizes his infatuation with Sebastian, much to the latter's disgust. He meets Madame while she is murdering a former patient. Grelle and Madame forge a partnership and continue the murders.

Source from Wikipeida