Unlike many action protagonists, 47 is defined by a monotone, non-threatening tone and a lack of hesitation or remorse, which makes him a more effective "silent assassin".
Instead of poisoning the drink, drop a lethal pill on the floor. The target doesn't pick it up. But the waiter does. The waiter puts it in the kitchen. The chef tastes it and dies. The target goes to investigate the commotion and stands under a falling moose head. That is better.
The Hitman series has consistently raised the bar for stealth games, with Agent 47 at its core. The games' focus on strategy, atmosphere, and player creativity has earned the series a loyal following. Each installment has built upon the last, refining the gameplay mechanics and expanding the narrative.