Bason was born in Tonga but moved to New Zealand with his family who are egg farmers. He attended Feilding High School where he played rugby and was named in the New Zealand Schools side in 2021. After leaving school he joined the Hurricanes academy system, representing the side in both 2023 and 2024. His performances earned him selection for the New Zealand [national under-20 rugby union team|New Zealand U20] side in both 2023 and 2024. He is one of three siblings to play rugby, with his sister Taufa representing New Zealand [women's national rugby union team|New Zealand women] and brotherMosese representing.