Non-MLB
Although they have not thrown an MLB pitch in 2024, Alberto Castillo threw 1,018 pitches that were tracked by the PITCHf/x system between 2008 and 2011, including pitches thrown in the MLB Regular Season and Spring Training. In 2011, they relied primarily on their Slider (80mph) and Sinker (89mph), also mixing in a Fourseam Fastball (90mph) and Change (84mph).
In 2011, compared to other LHP:
Their slider results in somewhat more flyballs compared to other pitchers' sliders and has some two-plane movement. Their sinker is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sinkers, is basically never swung at and missed compared to other pitchers' sinkers, has slight armside run, has slightly below average velo and has some natural sinking action. Their fourseam fastball has some natural sinking action, results in somewhat more groundballs compared to other pitchers' fourseamers, has slight armside run and has slightly below average velo. Their change (take this with a grain of salt because they've only thrown 16 of them in 2011) is basically never swung at and missed compared to other pitchers' changeups, dives down out of the zone, is slightly firmer than usual and has slight armside fade.