In 2013, Hiku left the Warriors and joined Sydney NRL club Manly Warringah Sea Eagles, playing mostly at for the Luke Williamson-coached Sea Eagles New South Wales Cup team. In Round 6 of the 2013 NRL season, Hiku made his NRL debut on the wing for the Sea Eagles in place of the injured David Williams against the Cronulla-Sutherland Sharks at Brookvale Oval, scoring a try on debut in Manly's 25-18 win. In his first game of NRL finals football in the 2013 season, in place of an injured Brett Stewart, Hiku was judged as man of the match despite Manly going down 4-0 to the 2013 minor premiers the Sydney Roosters at the Sydney Football Stadium. Hiku ran for a club record 297 metres on the night. Hiku later backed that up by running 231 in the following week's 24-18 semi-final win over Cronulla-Sutherland Sharks at the SFS. Stewart made a surprise return from injury in the preliminary final win over South Sydney and Hiku was considered unlucky to miss a place on the bench both against Souths and in Manly's grand final team which lost 26-18 to the Roosters. Hiku finished his debut year in the NRL as a “Mr Fix It” type player, mostly filling in for the injured Brett Stewart, playing in 13 matches and scoring 3 tries for the Manly-Warringah Sea Eagles in the 2013 NRL season.
2014
As of Round 7 of the 2014 NRL season, Hiku had played in all seven games for the Sea Eagles following injuries to other players, though when Brett Stewart and winger Jorge Taufua returned to the side coach Geoff Toovey retained Hiku in place of the out of form David Williams. On 2 May 2014, Hiku played his first test for New Zealand when he played at fullback in their 30-18 loss to Australia in the 2014 Anzac Test at the Sydney Football Stadium. On 13 May 2014, Hiku re-signed with Manly to the end of the 2017 season after the Canterbury-Bankstown Bulldogs offered him a contract who were searching for a fullback to replace the departed Ben Barba. Hiku, who has expressed his desire to stay with the Sea Eagles, also reportedly turned down a one million dollar contract to return to the New Zealand Warriors despite the opportunity to be closer to his family. Hiku cemented his place on the wing for the Sea Eagles, even keeping 2013 NRL top tryscorer David Williams in NSW Cup before "The Wolfman" was suspended for the season by the NRL due to a betting scandal. Hiku finished off the season with him playing in all of the Sea Eagles 26 matches and being the club’s highest tryscorer with 17 tries. On 23 September 2014, Hiku was selected in New Zealand's Four Nations train-on squad. On 7 October 2014, Hiku was selected in New Zealand's final 24 man squad for the Four Nations. Hiku played superbly at fullback in the Kiwi 30-12 victory over Australia on 25 October 2014 in the first game of the Four Nations tournament, helping the Kiwis to a 30-12 win over Australia, as well as their first win over Australia since the 2010 Four Nations final. Hiku went on to feature in every tournament game for the Kiwis, playing every minute of every game at fullback. Hiku played in the Kiwis 22-18 Four Nations final win over Australia at Westpac Stadium.
2015
On 31 January and 1 February, Hiku played for the Sea Eagles in the 2015 NRL Auckland Nines. He retained his spot in the New Zealand team for the 2015 Anzac Test, though he was moved to the centres as the Kiwis continued their Four Nations form with a 26-12 win over Australia at Suncorp Stadium. Hiku finished the 2015 season having played in 22 matches, scoring 8 tries and kicking 3 goals for the Sea Eagles. On 8 September, he was named in the New Zealand Kiwis training squad for their tour of Great Britain. He was a shock selection at five-eighth, playing in all three matches against England in the Kiwis' 2-1 Baskerville Shield series loss. In November, he was told by Manly's new incoming coach Trent Barrett that he was free to look for another club. He was linked with the Penrith Panthers, Parramatta Eels, South Sydney Rabbitohs and St. George Illawarra Dragons, eventually signing a 3-year contract with Penrith on 9 December, starting in 2016, after being released from the final two years of his Sea Eagles contract.
2016
In Round 1 of the 2016 NRL season, Hiku made his club debut for the Panthers against the Canberra Raiders, playing at centre and scoring a try in the Panthers 30-22 loss at Canberra Stadium. In Round 11 against the Gold Coast Titans, Hiku suffered a season ending knee injury in the Panthers 28-24 loss at Penrith Stadium. Hiku finished his 2016 NRL season early with him playing in 11 matches and scoring 5 tries in his first year with the Panthers.
2017
In Round 1 against the St George Illawarra Dragons, Hiku made his return for the Panthers where he suffered a fractured eye socket from a late hit from Dragons prop Russell Packer in the 42-10 shock loss at Jubilee Oval. Hiku was set to miss a month of footy but returned early in Round 3 against the Sydney Roosters where he came off the interchange bench in the 14-12 loss at Penrith Stadium. On 19 June 2017, Hiku was released from his contract mid-season from the Panthers to join the Warrington Wolves in the Super League after he was going behind in the pecking order for the centre and wing positions. Hiku finished his 2017 NRL season with the Panthers with him playing in 9 matches and scoring 1 try. Hiku scored his first try in a 22-6 victory over local rivals the Widnes Vikings, and then scored again against them the following week in a 28-14 win in Round 1 of the Super 8 Qualifiers. Hiku would go on to play in 11 matches and score 10 tries in his short stint for Warrington. On 9 October 2017, Hiku was granted a released from Warrington on compassionate grounds to sign with the New Zealand Warriors on a 3-year deal, starting from 2018. On 5 October 2017, Hiku was named in the 24-man New Zealand Kiwis squad for the 2017 Rugby League World Cup. Hiku only played in 1 match in the tournament which was against Scotland, where he scored a hattrick of tries in the 74-6 demolishing win at Lancaster Park in Christchurch.
2018
In Round 1 of the 2018 NRL season, Hiku made his club debut for the New Zealand Warriors against the South Sydney Rabbitohs, playing at centre in the 32-20 win at Perth Stadium.
2019
2020
Scored his 3rd career hat trick and first since 2015 vs North Queensland on 12 June 2020.
