>>272174513
welcome to the club. You really only need Ah Oh and Ch (and SIL, which is just basis) if you wanna be lazy, since cats will create the blends between them.
But, picture attached is the official reference for the viseme system. For anime characters it's best to go a bit extreme with ah oh and ch, exaggerate the mouth a bit, since your VOLUME determines how far from basis the mouth opens when you say AH for example.