Kikau played rugby union in his youth and later earned placements at Queen Victoria School and Marist Brothers High School in Suva, where he played for their rugby union team and represented the Fiji Secondary Schools side against the Australian Schoolboys. 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.
Kikau was the only player to sign with the club and joined their Holden Cup team for the 2014 season. At the time Kikau was also being scouted by a number of French rugby union clubs
In 2014, Kikau’s first season of rugby league, he played 21 games for North Queensland’s Holden Cup team, scoring 11 tries. A centre in his rugby union days, Kikau switched to prop after joining North Queensland.
In 2015, Kikau played in a pre-season trial game with North Queensland’s first grade team. He scored a try in the sides 24–12 victory over the Townsville Blackhawks.
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. On June 10, 2015, Kikau signed a two-year contract with the Penrith Panthers. 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.