I don't think 'Nards' would be a good nickname.
'Nards' is the nickname some people give the penis and testicles. You might as well shout 'Hey, Genitals!" when you see another Zelda fan in a crowd, because people are going to think someone just popped out their junk.
Zelda fan. Anything more ends up sounding lame or being used as an epithet.
Like 'Bronies.' Initially used as a simplistic collective term for some guys who liked MLP. Now often used as a pejorative for these same guys, considered weirdos who collect plastic pastel-colored ponies and...