I was non hotile TP, which basically means a neutral role, except that I had an objective to fulfill which resulted in people dying (but once again not by my fault). I could only turn hostile if I used the notebook myself, but I would also loose my immortality. There was really no reason for me to kill people unless it could just help complete the game for either side. And I could only kill people who used the notebook, not anyone else.
I just needed the notebook to be used twice, which seems easy but it could be stopped by either handing the notebook to wrong people or just blocking me or others having the notebook. Even two blocks could resulted into destroying the notebook.
The role was a bit more restricting than the original Shinigami in DNM but then again this was CYOR with different mafia mechanics.