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

rimi, 1girl, solo, black hair, short hair, smile, floral print skirt, looking at viewer, hair ornament, brown eyes, skirt, long sleeves, frills, dress, hairclip, bangs, blush, x hair ornament, ribbon, shirt, pink shirt, cslsk

School uniform Rimi:

rimi, 1girl, solo, school uniform, black hair, short hair, hanasakigawa school uniform, looking at viewer, brown dress, smile, dress, brown eyes, ribbon, long sleeves, double-breasted, buttons, bangs, sailor dress, red ribbon, collarbone, neck ribbon