Donovan

Donovan is a sadistic and deadly Nazi soldier. He initially presents himself as a confident fighter and seems to specialize in torture, claiming that he will find a way to make Joseph pass out from blood loss without killing him, and says that he would never talk, even when under torture. This proves to be a facade, as Joseph quickly makes him talk about the Nazi base just minutes after torturing him.

(Source: JoJo's Bizarre Wiki)