there are consequences to every choices you will take, but some are bigger then other.
Death Note Related :
Owning a Death Note Allows the character to be eligible to "Perma Death"
Using a Death Note makes the character "Doomed". meaning he is now locked into Perma Death mode , and if he dies he will loose EVERYTHING and his next character will start indebted and will have other handicaps.
If a criminal or a police, you can be killed by a Death Note "Perma Death" at any time (Requires a certain level in police)
Taking any action against or to help a death note owner will lock you into perma death mode.
Perma Death : You will need to make a new character.
"Tik, Tik, Tik.... Thats the sound of your life running out."