VIDEOS:
Not killing a pregnant woman
The arrested (supposedly) hitman from the Yami-Yami-gumi mentions that he's bound by yakuza code not to get the innocent involved. When a new oyabun orders him to get rid of a pregnant woman, that was the last straw for him.
Example of:
Hitman with a Heart
Rayla the Moonshadow Assassin
Example of:
Hitman with a Heart
Thane Krios
Example of:
Hitman with a Heart