The most experienced of the players is Nathan, one-time New Zealand No 1 who has played against the likes of Phil Taylor, and who returned to the sport in 2016 after retiring eight years earlier.
"Tania has also been there before," said Smith, "but Hano and Mai have only been playing darts for about two years."
Smith said the selections reflected moves to increase the profile and playing numbers in Rotorua.
"We've been working hard to make darts and the Geyserland Association a professional and competitive association and we feel like we are getting there now. We've won a couple of trophies this year as an association and to get five people in there we think we are heading in the right direction."
Club nights are each Tuesday at the Crates and Cue Bar.
"Our club nights are really competitive. We've got some real top-line players there. The guys who didn't make the team this year on a club night will be beating these [selected] players."
In March an association team took the Neville Powhero Trophy by winning a round robin competition against the other three Bay of Plenty Associations, the first time the trophy has been in Rotorua since 2005.
The week-long national championships in August start with inter-region competition.
Others to make the District 4 Associations' team were Ana Armitage, Judy Fenton (both Waihi), Shar Maru-Habib (Whakatane), Alex Wade, Lou Tai, Rodney Moreland, Brett Walters, Josh Walters, John Darlington (all Waihi), Puni Ngataki (Whakatane) and Mike Grimshaw (Kaimai).