I'm sure you can appreciate why I didn't specify this before since it would have made me a likely murder choice of a male mafia player, which since I haven't made use of my ability yet, would seem like a waste for town.
Why would a semi-bulletproof be concerned about NKs? You haven't revealed the condition for it.

Leaving that aside, a limited roleblock on half the player-base is not something that would drive the Mafia nuts. Why would Mafia see a restricted roleblocker as more dangerous than a full one?

Furthermore, Diana claims to have been blocked.

Your position is shaky. It don't make no sense.

Need I remind you how the other bulletproof-claimant turned out?