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

kuratamashiro, 1girl, solo, dress, long sleeves, ribbon, striped, blush, parted lips, blue dress, vertical stripes, striped dress, hair between eyes, neck ribbon, bangs, vertical-striped dress, short hair, looking at viewer, breasts, layered sleeves, frills, puffy sleeves, cslsk

School uniform Mashiro:

kuratamashiro, 1girl, solo, skirt, school uniform, pleated skirt, looking at viewer, serafuku, neckerchief, blue eyes, long sleeves, sailor collar, hair between eyes, blush, blue hair, bangs, tsukinomori school uniform