Career
Manihera is a native of Auckland, and came up through the ranks at his local club North Harbour, captaining their Under 20 side to the 2012 North Championship title. Although not initially selected in either the Blues regular squad or wider training group for the 2014 Super Rugby season, an injury to young, Auckland flanker Joe Edwards saw Manihera take his place. He was penciled in for a first super rugby game when the Blues took on the Crusaders in their second match of the season, however captain Luke Braid recovered from injury to take his place in the starting fifteen.
He was also later named in the Blues 27-man group for their 2 match tour of South Africa.
Manihera was a part of the New Zealand Under-20 squad which competed in the 2013 Institutional Review Board Junior World Championship in France.