Where does the character of the Grim Reaper come from?

the harvest is plentiful but he workers are few is a verse in the bible that describes a disciples mission to go out and baptize in the name of the father son and the holy spirit. bring people to salvation in Christ. A grim reaper is one who probably uses fear as their number one salvation tool. "if you dont repent youll go to hell" this is all just a guess. I would be intrested in your response.