I think if a team from Christchurch ever gets into the NRL, they should use the kea as their mascot - our alpine parrot with a huge sharp beak, native to the Southern Alps.
I think the kea concept is an incredibly unique concept, would love to see it someday. As an aside, there is no plural form of 'kea', so the team would be, for example, the South Island Kea.
I think any new NZ team has a great branding and marketing opportunity given the non-representation in our shared sporting leagues of animals in Te Reo (Maori language) or of native NZ animals in general (NZ Kiwis the exception of course...).
Less generic, less US-inspired, more specific please!