Yusei Kikuchi has thrown 2,882 pitches that have been tracked by the PITCHf/x system between 2019 and 2020, all of them occuring in the MLB Regular Season. In 2020, he has relied primarily on his Slider (92mph) and Fourseam Fastball (95mph), also mixing in a Curve (84mph) and Change (88mph).
Basic description of 2020 pitches compared to other LHP:
His slider is thrown extremely hard, is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sliders, has much less depth than expected and has primarily 12-6 movement. His fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, is blazing fast and has slightly less natural movement than typical. His curve is thrown extremely hard, is an extreme flyball pitch compared to other pitchers' curves, has primarily 12-6 movement and has little depth. His change (take this with a grain of salt because he's only thrown 14 of them in 2020) is thrown extremely hard, is an extreme flyball pitch compared to other pitchers' changeups, has slight cut action and has some natural sink to it.