Non-MLB
Although they have not thrown an MLB pitch in 2024, Anderson Severino threw 604 pitches that were tracked by the PITCHf/x system between 2022 and 2023, including pitches thrown in the MLB Regular Season and Fall/Winter Ball. In 2023, they relied primarily on their Fourseam Fastball (97mph) and Curve (78mph). He also rarely threw a Change (84mph) and Slider (85mph).
In 2023, compared to other LHP:
Their fourseam fastball is thrown at a speed that's borderline unfair and is an extreme flyball pitch compared to other pitchers' fourseamers. Their curve has an exceptional bite, is an extreme flyball pitch compared to other pitchers' curves, generates more whiffs/swing compared to other pitchers' curves and has slight glove-side movement. Their change (take this with a grain of salt because they've only thrown 5 of them in 2023) is basically never swung at and missed compared to other pitchers' changeups, has surprising cut action, is an extreme flyball pitch compared to other pitchers' changeups and is slightly firmer than usual. Their slider (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' sliders, results in more flyballs compared to other pitchers' sliders and has some two-plane movement.