Sam Witwer: This choice aligns with your suggestion of channeling a Palpatine-like aura. Witwer's deep, commanding voice could effectively portray Manfroy's manipulative and power-hungry nature.
Liam O'Brien: Another strong contender, O'Brien's voice can embody both charisma and villainy, adding a layer of complexity to Manfroy's character.
Keith David: Known for his powerful and authoritative voice, David could bring a menacing presence to Manfroy, emphasizing his ruthlessness.