Ryohei Oiwa is a Japanese professional wrestler signed to New Japan Pro-Wrestling (NJPW) and a member of The Mighty Don't Kneel (TMDK). He debuted as a Young Lion on August 24, 2021, before going on excursion to Pro Wrestling NOAH, where he won the 2024 Victory Challenge Tag League alongside Kaito Kiyomiya. Returning to NJPW in 2025, he made his G1 Climax debut and won the World Tag League alongside Zack Sabre Jr. At Wrestle Kingdom 20 in 2026, he captured his first career championship, winning the NEVER Openweight Six Man Tag Team Titles with Zack Sabre Jr. and Hartley Jackson. Later that year, he achieved his biggest singles accomplishment by winning the 2026 G1 Climax.