Although they have not thrown an MLB pitch in 2023, Hunter Harvey threw 1,080 pitches that were tracked by the PITCHf/x system between 2019 and 2022, all of them occuring in the MLB Regular Season. In 2022, they relied primarily on their Fourseam Fastball (98mph), also mixing in a Splitter (89mph) and Curve (83mph). He also rarely threw a Slider (87mph).
In 2022, compared to other RHP:
His fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, is thrown at a speed that's borderline unfair and results in somewhat more flyballs compared to other pitchers' fourseamers. His splitter is thrown extremely hard and has some natural sink to it. His curve generates fewer whiffs/swing compared to other pitchers' curves, is much harder than usual, results in more flyballs compared to other pitchers' curves and has a sharp downward bite. His slider (take this with a grain of salt because he's only thrown 3 of them in 2022) is basically never swung at and missed compared to other pitchers' sliders, is an extreme flyball pitch compared to other pitchers' sliders, is much harder than usual, has primarily 12-6 movement and has some two-plane movement.