Young Lion (2018–2020)

In 2018, Coughlin entered the New Japan Pro-Wrestling LA Dojo, as the first class along with Karl Fredericks and Clark Connors, training under Katsuyori Shibata. Coughlin made his in-ring debut, where he was defeated by Connors in a dark match at Fighting Spirit Unleashed. Coughlin visited Japan for the first time as a representative of the LA Dojo at the Young Lion Cup held in September 2019 and came third in the tournament along with Connors with 8 points.^[4][5] Over the next year, Coughlin would lose to many New Japan wrestlers and draw to his fellow young lions, which is common for young lions during their training. Whilst Fredericks and Connors achieved more success, Coughlin continued to train and lose to New Japan wrestlers, due to having less wrestling background prior to joining the Dojo. Through New Japan's partnership with other promotions, Coughlin was also able to make many appearances for Ring of Honor and Revolution Pro Wrestling. Coughlin was regularly featured on Game Changer Wrestling's Bloodsport.^[6][7] On January 4, 2020, at Wrestle Kingdom 14, Coughlin, Fredericks, Connors and Toa Henare defeated Tencozy (Satoshi Kojima and Hiroyoshi Tenzan), Yota Tsuji and Yuya Uemura in an eight-man tag-team match.^[8]

The Android (2021–2023)

In March 2020, New Japan suspended all of its activities, due to the COVID-19 pandemic, causing American-based talent, such as Coughlin to not be able to travel to Japan. Therefore, Coughlin appeared primarily on New Japan's new American-based show NJPW Strong, where he would mainly team up with his LA Dojo teammates. Whilst, Fredericks and Connors had already graduated from being Young Lions due to winning the Young Lion Cup and the Lion's Break Crown respectively, Coughlin would start a ten-match challenge series, facing a range of competitors each week. He would lose the first 8 matches, losing to the likes of Josh Alexander, Tomohiro Ishii and even Fredericks. However, in the ninth match, he defeated J. R. Kratos, after the match Coughlin announced he had graduated as a Young Lion.

In February, Coughlin returned to the UK, continuing to make appearances for Revolution Pro Wrestling. During this time, Coughlin began using the nickname, "The Android", a comparison to his machine-like strength. Also in March, the LA Dojo, which was still represented by graduates like Coughlin, Connors, and Fredericks, began a feud with All Elite Wrestling's The Factory as they fought over which was the superior wrestling developmental system. This led to Coughlin and other LA Dojo members making their debuts on the May 10 edition of AEW Dark, saving the LA Dojo’s The DKC and Kevin Knight from a post-match attack by The Factory. The following week, LA Dojo members defeated The Factory in a ten-man tag team match.^[9] On June 26, Coughlin teamed with Yuya Uemura, The DKC, and Kevin Knight on the Buy-in of AEW x NJPW: Forbidden Door in a losing effort to Max Caster and The Gunn Club's Billy Gunn, Austin Gunn and Colten Gunn.^[10] Shortly after, it was announced that Coughlin had suffered a leg injury.^[11][12]

Coughlin returned in November on the pre-show of Historic X-Over, teaming with LA Dojo stablemates, Clark Connors, Kevin Knight and Gabriel Kidd to defeat Kosei Fujita, Oskar Leube, Ryohei Oiwa and Yuto Nakashima.^[13] A few days later, Coughlin and Kidd teamed together in the World Tag League, however finished bottom of their block with just 2 points.^[14]

In February, Coughlin defeated J. R. Kratos on the kickoff show of Battle in the Valley.^[15] The following month at Multiverse United, Coughlin teamed with Sami Callihan, Fred Rosser and PCO to defeat Eddie Edwards, Joe Hendry, Tom Lawlor and J. R. Kratos.^[16] At NJPW Collision in Philadelphia, Coughlin defeated Tracy Williams.^[17] On the buy-in of Resurgence, Coughlin defeated Christopher Daniels.^[18]

Bullet Club (2023–present)

On June 4 at Dominion, Coughlin and Gabriel Kidd, branded as Bullet Club War Dogs attacked Bishamon (Hirooki Goto and Yoshi-Hashi), following their victory of capturing both the IWGP Tag Team Championship and the Strong Openweight Tag Team Championships, signalling their challenge for both titles, whilst also turning both men heel for the first time. The duo later accompanied Bullet Club leader, David Finlay to the ring in Bullet Club shirts, officially joining the stable^[19] On July 4 on night 1 of NJPW Independence Day, Coughlin and Kidd defeated Bishamon to win the Strong Openweight Tag Team Championships, marking both men’s first NJPW championships.^[20] The following Day on Night 2, the duo lost to Bishamon, in a losing effort to capture the IWGP World Tag Team Championships.^[21] Later in the month, Coughlin entered his first G1 Climax tournament, where he would compete in the D Block.^[22] Coughlin finished the tournament with a total of 6 points, failing to advance to the quarterfinals.^[23] On October 9 at Destruction in Ryōgoku, Coughlin and Kidd lost the Strong Openweight Tag Team Titles to Guerrillas of Destiny (El Phantasmo and Hikuleo), ending their reign at 97 days.^[24]

The duo attempted to rebound the following month, entering the annual World Tag League, competing in the A-Block.^[25] Coughlin and Kidd finished joint top of their block, with 10 points, advancing to the semi-final round.^[26] In the semi-final round, the duo were defeated by Bishamon, eliminating them from the tournament.^[27]