No, just look at the characters already there and see if it fits well.  Also, note my comments about the basic character requirements.  (There are different levels of nuts.)  And just because you are paranoid doesn't mean you aren't being followed.  (My character was a Cold War "spy".  He's seen MIB's following him.  Really, he has...)

Oh ... and by the way, the aluminum foil USED to work.  The aliens have stepped up their game.  What?  You didn't KNOW that?