I have all the four stars on this banner. Bloody Rosaria is c4 now and I will probably never use her :')
The main ones that I still really want are Kazuha and Xiao. Otherwise there's a few five stars I'd like but I'm not desperate for - Shogun, Kokomi, Kokomi, Diluc, Klee, Yoimiya and Itto are all cool haha.