Toyama Kasumi from BanG Dream.
It is 100 official pictures and autotags.
Example prompt for casual Kasumi:

kasumi, 1girl, solo, cone hair bun, brown hair, purple eyes, clothes around waist, looking at viewer, blue shirt, hair ornament, smile, breast pocket, hair bun, pocket, shirt, star hair ornament, jewelry, blush, necklace, short sleeves, star (symbol), bangs, jacket around waist, star necklace, cslsk

School uniform Kasumi:

kasumi, 1girl, solo, cone hair bun, hanasakigawa school uniform, brown hair, purple eyes, hair ornament, hair bun, looking at viewer, brown dress, dress, smile, double-breasted, star hair ornament, long sleeves, star (symbol), pleated dress, bangs, ribbon, sailor dress, red ribbon