[3] In 2013, Kikau who never played rugby league was scouted by North Queensland recruiter Adrian Thomson in a schoolboy match and was one of three Fijian players who spent six weeks in Townsville.

[7] On 2 May 2015, Kikau made his international debut for Fiji against Papua New Guinea in the Melanesian Cup match, playing off the interchange bench in the 22–10 win at Robina Stadium.

[10][11] On 14 September 2015, Kikau was named at prop in the 2015 NYC Team of the Year, finishing his Holden Cup career with the North Queensland club with 32 tries from 42 matches.

[13] In Round 2, Kikau made his NRL debut for the Penrith Panthers against the Wests Tigers, playing off the interchange bench and scoring a try in the 36–2 win at Campbelltown Stadium.

[17] A week later on 1 October, Kikau played in the NRL State Championship match against QLD Cup winners the Papua New Guinea Hunters starting at second-row and scoring a try in the 42–18 boilover win.

Kikau made a total of 18 appearances for Penrith in the 2019 NRL season as the club finished 10th on the table and missed out on the finals for the first time since 2015.

Kikau scored a second half try in the final but was disallowed on review due to the pass from Nathan Cleary being ruled forward.

[28] Following Penrith's grand final victory, an intoxicated Kikau went on Instagram and mocked South Sydney by singing their club song.

[31] Kikau played 25 games throughout the season for Penrith including the club's 2022 NRL Grand Final victory over Parramatta.

[32] In the second group stage match of the 2021 Rugby League World Cup, Kikau scored two tries for Fiji in their 60-4 victory over Italy.