Non-MLB
Although they have not thrown an MLB pitch in 2024, Luis Santos threw 720 pitches that were tracked by the PITCHf/x system between 2017 and 2023, including pitches thrown in the MLB Regular Season and Fall/Winter Ball. In 2023, they relied primarily on their Fourseam Fastball (92mph), Slider (83mph) and Change (85mph). He also rarely threw a Sinker (89mph).
In 2023, compared to other RHP:
Their fourseam fastball is basically never swung at and missed compared to other pitchers' fourseamers, is an extreme flyball pitch compared to other pitchers' fourseamers, has some natural sinking action, has slight armside run and has slightly below average velo. Their slider is an extreme flyball pitch compared to other pitchers' sliders. Their change (take this with a grain of salt because they've only thrown 19 of them in 2023) generates fewer whiffs/swing compared to other pitchers' changeups, results in somewhat more flyballs compared to other pitchers' changeups and has some natural sink to it. Their sinker (take this with a grain of salt because they've only thrown 2 of them in 2023) is basically never swung at and missed compared to other pitchers' sinkers, has an obvious tail, is an extreme flyball pitch compared to other pitchers' sinkers, has below average velo and has some natural sinking action.