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Luke Valentine, a vampire and antagonist in'Hellsing Ultimate', is voiced by Patrick Seitz. Seitz is a renowned voice actor known for his deep and resonant voice, which perfectly captures Valentine's enigmatic and sinister nature. Valentine's character is characterized by his arrogance, cunning, and unwavering loyalty to his master, Alucard. Seitz's vocal performance brings depth and complexity to Valentine, making him a memorable and formidable character in the series.