Hikuleo is the son of legendary professional wrestler King Haku, and the younger brother of Tama Tonga and Tanga Loa. At 203cm, 120kg and only 27 years of age, Leo easily made his presence felt in the ring from day one and quickly became known as the Young Gun of BULLET CLUB. A 2018 excursion to the UK would then see him transition to the US and NJPW STRONG. 

When Jay White and BULLET CLUB expelled Tama Tonga, Tanga Loa and Jado from the group in the spring of 2022, Hikuleo was given a choice between siding with Jay and the club, or with his brothers. After a singles match with the Switchblade, Hikuleo accepted the invitation to remain with BULLET CLUB. Yet friction would grow, and when his loyalty was tested at Burning Spirit in Kobe September 25, Hikuleo sided with Tama Tonga, joining his brother in the Guerrillas of Destiny and Hontai. White vowed revenge however, and chalenged Hikuleo to a Loser Leaves Japan match in Osaka on February 11, 2023.