Growing up, practiced at the nine-hole Chevy Chase Country Club in Glendale, California. Never let himself hit off mats to avoid giving himself a flat lie.

Graduated from University of California-Berkeley in May of 2019 with a bachelor's degree in business administration from the Haas School of Business, which ranked third on the 2020 U.S. News and World Report for Best Undergraduate Business Programs. On September 27, 2021, Cal announced the creation of two endowed scholarships to honor the legacies of Morikawa and Max Homa and their contributions to the Cal men's golf program. "I owe a lot to Cal golf. It was a huge four years of my life that I would never trade in for anything."

As a little kid, his dream was to throw out the first pitch at a Los Angeles Dodgers game. On September 3, 2019, his wish came true, as he threw out the first pitch and called it one of the “most memorable moments in my life.”

Parents are Blaine and Debbie. Blaine is Japanese-American from Hawaii and Debbie is Chinese-American from California.