To answer the question does NZ have resident nobility, the answer is YES we do, we in fact have two monarchies which live in conjunction with each other. Queen Elizabeth is technically Queen Elizabeth of New Zealand and the commonwealth, we are infact a separate realm to Britain and she can grant titles if she wishes, but has rearly happened, she is the only New Zealander who inherits a title within New Zealand, most noble titles are only a life title. Also New Zealand does not have a peerage system like Britain, we have only one ruling house and that is parliament, we use to have two but that was abolished in the 1950s. We then have a Maori King, who has no political power, but rather a cultural influence, the movement for the king is called the Kingitanga- which was created in the 1860s in retaliation to colonisation.However, the Maori king is King within the Kingitanga- which is recognised by only a few tribes but respected by mostly all
Pre-colonisation New Zealand already had a society, the tribes within New Zealand were basically like little Kingdoms, which were ruled or governed by the Maori Cheifs, then High Chief or otherwise known as Ariki/King which ruled supreme. There structures were as follow.
Ariki/paramount Chief/King -
Chief
PUHI , female princess or known by some as a sacred virgin, but this status was usually given to the eldest daughter of a chief, or selected by the chief. A PUHI was kept sacred and protected by the tribe.
Rangatira - nobility/ Aristocrats
Commoners - usually family members of Rangatira
Slaves - captured from other tribes, however they were treated with some degree of respect, it was not uncommon for slaves to marry commoners.
The only difference with Maori Nobility and European nobility is Maori aristocrats are un-titled which in British terms would make a Maori Family of high noble Maori birth commoners,eg a daughter of an Ariki/king would simply be Miss. In England, it’s the title that makes you Aristocratic, also you have to Remember that wealth does not make you a member of Nobility, you have to be born into it, whether the noble is poor or rich, they are still noble.The Maori King we do have is only king within his realm, which is narrower than Maori society itself. The Maori King ancestor was selected to be king because he could trace back to most tribes and there original vessels that landed in nz.
Within the tribe that hosts the Maori King movement is a family that’s actually more royal than the king himself and I do believe that’s the Wetere family, an Aristocratic Maori family similar to plantaginin family, the wetere’s have through there birth right enjoyed Royal privileges through much of the land that was handed down to them, most of this land , I am unsure if they still retain much of this land. There are also Royal families in Taranaki,NZ which unfortunately lost there lands during colonial era. So to answer your question, Yes New Zealand has resident nobility, and it is full of Ancestral Knights/ Warriors and Aristocrats and Royal families, except it did not have the wealth to sustain there status.