Non-MLB
Although they have not thrown an MLB pitch in 2024, Logan Darnell threw 394 pitches that were tracked by the PITCHf/x system in 2014, all of them occuring in the MLB Regular Season. In 2014, they relied primarily on their Sinker (91mph) and Slider (84mph), also mixing in a Change (82mph) and Curve (70mph). He also rarely threw a Knuckleball (87mph).
In 2014, compared to other LHP:
Their sinker has less armside run than typical and results in somewhat more groundballs compared to other pitchers' sinkers. Their slider has primarily 12-6 movement. Their change is basically never swung at and missed compared to other pitchers' changeups, results in more flyballs compared to other pitchers' changeups and has some natural sink to it. Their curve comes in below hitting speed, generates an extremely high number of swings & misses compared to other pitchers' curves, is an extreme flyball pitch compared to other pitchers' curves, has little depth and has slight glove-side movement. Their knuckleball (take this with a grain of salt because they've only thrown 1 of them in 2014) flutters and floats unpredictably toward the plate.