Futaba Tsukushi from BanG Dream.
It is 100 official pictures and autotags.
Example prompt for casual Fusuke:

futabatsukushi, 1girl, solo, dress, twintails, yellow dress, polka dot, smile, looking at viewer, long hair, polka dot dress, black hair, blush, belt, hair ornament, bangs, long sleeves, cslsk

School uniform Fusuke:

futabatsukushi, 1girl, solo, skirt, school uniform, twintails, serafuku, pleated skirt, looking at viewer, long hair, long sleeves, neckerchief, shirt, sailor collar, black hair, bangs, tsukinomori school uniform