Hiroyoshi Tenzan
On 4 January 2016, Fifita, as King Haku, made a surprise return to New Japan Pro-Wrestling, taking part in the New Japan Rumble on the Wrestle Kingdom 10 pre-show. During the appearance he represented his son Tama Tonga's Bullet Club stable. He was eliminated from the match after submitting to Hiroyoshi Tenzan. The following day, Haku teamed with his son and fellow Bullet Club members Doc Gallows, Karl Anderson and Yujiro Takahashi in a ten-man tag team match, where they defeated Hiroyoshi Tenzan, Kushida, Satoshi Kojima, Togi Makabe and Tomoaki Honma. Haku next appeared at NJPW's G1 Special in USA on 2 July 2017, alongside his sons.