He is 1.78m tall and weighs 115kg. He made his international debut on the tour to Australia in June 2003. A long-time member of the Suva squad, Naca won the selectors over with his aggressive front-row efforts at the trials that May. He got his first taste of action in Fiji’s opening match of 2003 – a narrow one-point loss to the ACT Brumbies in Canberra, and later he made his Test debut coming on as a replacement against Argentina.
Seru played one season for the New Zealand NPC team Buller in 2001, and also played rugby league in Australia before featuring for the Fiji Bati side. He was a member of the Fiji team to the 2003 Rugby World Cup.