If you heard anything you liked there, here’s some background for those artists since many people don’t follow JRock or post-punk. Despite living here a decade I am still getting in to JRock myself.
Unlike JPop, JRock trends bass-heavy and hard so it’s a fertile ground for kickass bass players.
Kiyoshi is the bass player for Marty Friedman’s (of Megadeth fame) band. She is also full time in at least two other bands and has a solo career with three albums (so far) of just her and a drummer. She’s my favorite recent discovery and definitely worth looking in to - I would say she is the best of the bunch for originality and (except maybe Boh) technical skill. That video is just of her practicing form, like we all do, but much faster.
Boh, in addition to his own stuff, is the bass player for BABYMETAL. If you have written off BABYMETAL as a gimmick idol band, don’t - the producer that formed them had the brilliant vision to back them with a really tight metal band and they are a huge act now.
F Chopper Koga is the bass player for the band Gacharic Spin. They and their side project Doll$boxx are kind of quirky slap-bass-heavy hard pop/rock - and they are all solid musicians.
Peter Hook is the bass player from the original post-punk band Joy Division and subsequently the '80s genre-defining band New Order, my favorite bands and my favorite bassist. He’s cited as an influence by many indie and alternative rock bassists primarily because he pioneered a unique style.
Misa is the bass player for the theme-metal band Band Maid. There’s a story behind this one but the basic gist is a maid cafe waitress got fed up and convinced a bunch of extremely talented music school grads to form a very aggressive rock/metal band - while still dressing as maids as a theme for contrast and irony (and presumably ticket sales).
Reita is the bass player for The Gazette. They run the gamut from (very) hard rock through metal to punk. While Reita’s hands pretty much look normal size to me, he can do superhuman stretches with them.
And none of them have large hands