Non-MLB
Although they have not thrown an MLB pitch in 2024, James Russell threw 5,604 pitches that were tracked by the PITCHf/x system between 2010 and 2017, including pitches thrown in the MLB Regular Season and Spring Training. In 2017, they relied primarily on their Fourseam Fastball (90mph) and Change (82mph), also mixing in a Slider (85mph).
In 2017, compared to other LHP:
Their fourseam fastball (take this with a grain of salt because they've only thrown 5 of them in 2017) generates an extremely high number of swings & misses compared to other pitchers' fourseamers, is an extreme flyball pitch compared to other pitchers' fourseamers, has much less armside movement than typical and has slightly below average velo. Their change (take this with a grain of salt because they've only thrown 3 of them in 2017) has surprising cut action, is an extreme flyball pitch compared to other pitchers' changeups and has a lot of backspin. Their slider (take this with a grain of salt because they've only thrown 1 of them in 2017) is basically never swung at and missed compared to other pitchers' sliders, results in more flyballs compared to other pitchers' sliders, is much harder than usual and has less than expected depth.