Rlfj has certainly created a variant of the trope you seek.
Graham (Grim) Reaper is a not too smart, lower middle class ordinary guy who just wants to marry his girl and have a family.
From the earliest age he has learned to defend those weaker than him, even if it means being hospitalized.
Through lack of other options he becomes a soldier, one who finds he cannot miss and no matter how wounded, does not die. Out of the army, even though suffering PTSD he becomes a Cop. He confronts evil and although never instigating violence, evil and violence come to him and the body count keeps mounting.
The story covers the normal romance, coming of age, small town boy made good and military fiction plot lines, with a believable flawed MC. Buried beneath that are the tropes of justice personified and reaper of souls who does so because that is his roll in the world.
Well worth a read, its free on SOL. I paid for my copy, rlfj is Rollie Lawson on Amazon for those who care.