Oku debuted for Revolution Pro Wrestling (RevPro), facing Great-O-Khan in a losing effort.[4] On January 6, 2019, he fought for Team ELP and lost a eight man tag team match against Team David Starr.[5] He soon started having a losing before defeating the Undisputed British Cruiserweight Champion El Phantasmo in a non title match, which earn him a title match at RevPro Summer Sizzler, which he failed to win.[6] On November 24, Oku defeated Rocky Romero in the first round and made El Phantasmo submit in a 4-Way Elimination Match to win the 2019 British J-Cup. After the match, he was attacked by Pac.[7] He would get his revenge, by defeating Pac at Uprising on December 15.[8]
On February 14, 2020 at High Stakes, Oku beat Phantasmo for the British Cruiserweight Championship.[9] On September 13, 2020 at Epic Encounters 2, Oku defeated Ricky Knight Jr. to unify the title with the Southside Speed King Championship.[10] He soon started appearing in tag matches with Connor Mills as Destination Everywhere and, after Great British Tag League over Dean Allmark and Lee Hunter, won the British Tag Team Championship on The Legion (Lucian Phillips and Screwface Ahmed) in the finals to win the vacant titles.[11][12] After three months, Destination Everywhere lost their British Tag Team Championship to Aussie Open (Kyle Fletcher and Mark Davis) in a winner takes all match, where Aussie Open's PWA Tag Team Championship was also in the line.[13] After a two-year reign, with a number of title defences, Oku lost the Undisputed British Cruiserweight Championship to Luke Jacobs, ending his reign at 890 days.[14]
Oku ended up winning the 2023 RevPro Revolution Rumble, earning a match for the Undisputed British Heavyweight Championship, which he won by defeating Great-O-Khan on July 7, 2023 at Epic Encounter.[15] Oku made his first title defence on August 26 at RevPro 11th Anniversary Show, defeating Trent Seven.[16] On September 23, Oku made another defence, defeating Hechicero at RevPro/CMLL Fantastica Mania UK night 2.[17] On October 23 at British J-Cup, Oku defended his title against Gabe Kidd.[18] A month later, Oku defended his title against Luke Jacobs and made his final title defence of the year, against Zack Gibson.
Oku made his first title defence of 2024, defeating Will Ospreay at High Stakes, in Ospreay's final match with the company.[19] The match was acclaimed and received a six-star rating from Dave Meltzer, making it the first six-star match of Oku’s career.[20]
It was announced on May 1, 2024 in CMLL Informa that he would participate in Fantastica Mania México 2024 and later a tour.[25][26] On June 14 at Arena Mexico he debuted, losing against Templario.[27] On June 15 at the Arena Coliseo he defeated Volador Jr..[28][29] On June 16 in the Arena Mexico he teamed up with Bad Dude Tito and Che Cabrera but they lost against Último Guerrero, Angel de Oro and Gran Guerrero.[30] On June 17 at the Arena Puebla, Mistico's 20th anniversary was celebrated, he teamed up with Bad Dude Tito and Che Cabrera where they defeated Los Depredadores (Volador Jr., Magnus and Rugido).[31] On June 18, he defended his title against Angel de Oro at the Arena Mexico.[32] On June 19, Michael Oku, along with Amira Blair and Okumura, received the invitation from the Deputy Head of the British Embassy, Carol van der Walt, and Rachel Brazier, Chargé d'Affaires.[33]
