Rubber Duck
Hulk
The Hulk's durability operates on an entirely different paradigm—one of active regeneration rather than passive resilience. His gamma-mutated physiology can withstand nuclear detonations, cosmic forces, and the combined might of Earth's mightiest heroes. Yet this very indestructibility betrays a fundamental weakness: the Hulk can be hurt. He bleeds, he staggers, he requires healing. His durability is reactive, demanding constant biological processes to maintain. Furthermore, the Hulk's existence depends entirely upon Bruce Banner's continued survival and psychological state. Remove the anger, and the green guardian simply ceases to be. The rubber duck suffers no such existential vulnerabilities.