Although he has not thrown an MLB pitch in 2020, Yoshihisa Hirano threw 2,074 pitches that were tracked by the PITCHf/x system between 2017 and 2019, including pitches thrown in the MLB Regular Season, The World Baseball Classic and Spring Training. In 2019, he relied primarily on his Splitter (84mph) and Fourseam Fastball (91mph). He also rarely threw a Curve (75mph).
Basic description of 2019 pitches compared to other RHP:
His splitter results in many more groundballs compared to other pitchers' splitters and has some natural sink to it. His fourseam fastball has slightly below average velo. His curve (take this with a grain of salt because he's only thrown 6 of them in 2019) is basically never swung at and missed compared to other pitchers' curves, results in more flyballs compared to other pitchers' curves, has primarily 12-6 movement and has slightly below average velo.