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

hiromachinanami, 1girl, solo, smile, dress, long sleeves, hair ornament, looking at viewer, jewelry, bangs, belt, two side up, blush, necklace, pink hair, pink dress, hairclip, shirt, medium hair, pink eyes, ribbon, white shirt, pinafore dress, cslsk

School uniform Nanami:

hiromachinanami, 1girl, solo, skirt, pleated skirt, smile, hair ornament, school uniform, neckerchief, looking at viewer, shirt, two side up, long sleeves, serafuku, bangs, collarbone, hairclip, sailor collar, tsukinomori school uniform