In 1986, King Tonga, in his rookie year in the World Wrestling Federation, became a star by bodyslamming Big John Studd on Championship Wrestling. He made a name for himself as Haku in the WWF as half of "The Islanders" with Tama. The team had a classic feud with the British Bulldogs that was started when the Islanders, along with manager Bobby Heenan, kidnapped the Bulldogs' mascot, a Bulldog named Matilda.

In 1988, following King Harley Race's injury sustained in a match against Hulk Hogan, Haku was given Race's crown and robe and was rechristened "King Haku." He would cement his position as king by successfully defending his crown against the returning Race in a match at that year's Royal Rumble. He would later lose the "crown" to Hacksaw Jim Duggan. He would later go on to form the tag team known as The Colossal Connection with André the Giant and win the WWF Tag Team Championship. After he and André lost the titles, he formed a tag team with The Barbarian.

In WCW, Fifita wrestled as Meng. He was initially portrayed as the mysterious and intimidating bodyguard of Col. Rob Parker, wearing business suits and shades while maintaining a quiet demeanor. Opponents of Parker's Stud Stable were typically shown to keep their distance from him. On the rare occasions in which he became physical with wrestlers (usually in incidents after matches had concluded), he was often portrayed as highly powerful. Eventually, Meng became a wrestler himself, winning his first match against a jobber with one fast high kick. Teaming with Kurasawa, he feuded against Sting and Road Warrior Hawk.

Later, he faced Sting in a losing effort for the vacated United States title at The Great American Bash '95. Meng later joined the Dungeon of Doom forming a tag team named the Faces of Fear with his old partner The Barbarian. He was touted as being a former bodyguard to the Emperor of Japan. Meng's finishing maneuver was the feared Tongan Death Grip, a nerve grip on the Adam's apple applied to a standing victim who would drop into a prone position and experience the full effect of the hold.

Meng spent much of 1997 facing mainly lower and mid-card performers before starting a small rampage of a winning streak in the summer of 1998. This lead to his main event World Championship match with Goldberg on the edition of Monday Nitro. Goldberg, too, had culminated an impressive winning streak and retained his title that night. In the spring of 1999, when Ric Flair was the (kayfabe) president on WCW programming, the barbaric Meng would often annihilate Flair's enemies per his instructions. Later on, Meng had a short-lived feud with Sting and occasionally faced uppercard stars like Lex Luger and WCW Champion Bret Hart. He also participated in matches for the newly introduced WCW Hardcore Championship toward the end of 1999. Meng finally won the title at the Sin pay-per-view on January 14, 2001. He became the final WCW Hardcore Champion.

Exactly one week after his WCW Hardcore Championship win at Sin, Fifita returned to the WWF as Haku and made a surprise appearance at the 2001 Royal Rumble. In response to his defection WCW vacated the Hardcore Championship and never reinstated it. After the Rumble, he formed a tag team with Rikishi, but the team did not last long due to Rikishi's injury. Haku was left to wrestle on the lower card shows like Sunday Night Heat. He was eventually released from WWF, his final opponent being Shawn Stasiak on a WWF Jakked taping in Buffalo, NY on July 23, 2001. He still wrestles on occasion on the independent scene. He was chosen as the tag partner of Genichiro Tenryu on May 3, 2004. Haku now wrestles in various independent promotions.

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