If Arandor is the blocker, and the killer stole his Night Guard and blocked Naira, then who does Naira become? Mafia.
Go ahead and vote, in any case, she's a negative influence.
I think Arandor is fine. We have a choice between Naira and Arandor.
Added 2 minutes later
I can't be the killer because the killer is useful to the town, and I've been doing useless things the whole game.