Non-MLB
Although they have not thrown an MLB pitch in 2024, Reymin Guduan threw 890 pitches that were tracked by the PITCHf/x system between 2017 and 2023, including pitches thrown in the MLB Regular Season, Spring Training and Fall/Winter Ball. In 2023, they relied primarily on their Fourseam Fastball (95mph) and Slider (83mph). He also rarely threw a Change (78mph) and Cutter (92mph).
In 2023, compared to other LHP:
Their fourseam fastball generates a very high amount of groundballs compared to other pitchers' fourseamers, generates fewer whiffs/swing compared to other pitchers' fourseamers, has less armside movement than typical and has well above average velo. Their slider is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sliders, has exceptional depth, generates a high number of swings & misses compared to other pitchers' sliders and has primarily 12-6 movement. Their change (take this with a grain of salt because they've only thrown 1 of them in 2023) comes in below hitting speed, is basically never swung at and missed compared to other pitchers' changeups, is an extreme flyball pitch compared to other pitchers' changeups and has a lot of backspin. Their cutter (take this with a grain of salt because they've only thrown 1 of them in 2023) is thrown at a speed that's borderline unfair, is basically never swung at and missed compared to other pitchers' cutters, is an extreme flyball pitch compared to other pitchers' cutters and has strong cutting action.