I know a hell of a lot of warriors fans (well, I AM a Kiwi....), and the vast majority of them are really cool people. That changes once you walk into Ericsson Stadium in an opposition jersey. They become VERY hostile.
From the other teams supporters that I know here in NZ:
Bulldogs fans are very staunch and fiercely proud of their team for some reason.
Manly fans hang on to the glory days of the '90s
Roosters fans tend to bring up the 1975 GF a lot, though conveniently forget the number of times from the mid '90s onwards that they have been knocked out of the finals by the Dragons.
Brisbane fans expect to win the title every year, and have proven (out of the ones I have met, anyway) to be arrogant f**kheads.
Canberra fans are left over from the halcyon days of the '90s and are convinced they will become a superpower again any year now.
Parra fans are mouthy, at least while they're winning. Seemed to vanish after the 29-0 hiding. Are a good bunch from the lot I've met, though.
Tigers fans didn't seem to exist until the GF last year - now you see a lot of brand new Tigers strips around in Auckland.
The number of Cowboys fans seems to have multiplied exponentially in the last two seasons.
The few fellow Saints fans I know here cling to the past much like Roosters fans, but are a good bunch regardless (but I'm biased...)
Sharks fans are few, but nevertheless very vocal until reminded about the "39 years and won f--k all"...
The 2 Souths fans I know tend to rant about last years Charity Shield match as if it was a GF and tend to call me a loser....go figure. Very proud, though.
