Australia's reigning champions named Dragons forward Hamish Stewart a shadow player on Monday.
At 22, he was the youngest Dally M Team of the Year player and youngest male Dragon to win the club medal.
His season included five tries, nine try assists and a competition-leading 996 tackles.
Fiji selected Maria Paseka, who debuted internationally last October with four tries in two matches, after helping its World Cup qualifying campaign.
The 20-year-old made the Dragons' Top 24 and was an RLPA Dream Team finalist; she scored three tries in 10 appearances this season.
Valentine Holmes will make his Cook Islands Aitu debut; he has represented Australia 21 times, scored 20 tries and won two World Cups.
Reuben Porter also made the squad after four NSW Cup games and helping Corrimal reach the Illawarra League grand final.
New Zealand named Brooke Anderson and Trinity Tauaneai, alongside Tauaneai's sister Alexis and Angelina Teakaraanga-Katoa, both signed to join the Dragons in 2027 on two-year deals.
Anderson captained the Dragons in all 11 games, while Tauaneai won the club's Emerging Talent award in her rookie season.
Fetu Samoa named Taliah Fuimaono and Tyra Ekepati for its first World Cup campaign.