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

tsurumakikokoro, 1girl, solo, long hair, blonde hair, yellow eyes, shirt, smile, striped shirt, striped, button badge, badge, looking at viewer, jewelry, bangs, overalls, short sleeves, red shirt, overall shorts, smiley face, ???????, ??????????????, necklace, cslsk

School uniform Kokoro:

tsurumakikokoro, 1girl, solo, blonde hair, hanasakigawa school uniform, long hair, yellow eyes, dress, smile, school uniform, ribbon, looking at viewer, long sleeves, red ribbon, bangs, buttons, double-breasted, neck ribbon, sailor dress, pleated dress, brown dress, blush