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Valkenhayn R. Hellsing is one of the Six Heroes and Rachel's elderly butler and trusted advisor who has served the Alucard family line for generations. He possesses a sharp wit and is concerned for Rachel's well-being. Valkenhayn seems to be worried about Rachel associating with things below her class (particularly Ragna, although others might apply), but he always acts in a sophisticated and gentlemanly manner. Judging from comments frequently dropped by Rachel, he seems to have once been a vigilante himself. He seems to know Terumi well enough to recognize him on sight, even though Terumi can change shape.

Source from Wikipeida