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

ueharahimari, 1girl, solo, twintails, pink hair, green eyes, low twintails, skirt, looking at viewer, long sleeves, bang, plaid, blush, white shirt, shirt, high-waist skirt, collarbone, plaid skirt, grey skirt, medium hair, cslsk

School uniform Himari:

ueharahimari, 1girl, solo, skirt, pink hair, low twintails, necktie, twintails, jacket, green eyes, smile, school uniform, looking at viewer, blazer, grey jacket, green skirt, pleated skirt, plaid, plaid skirt, shirt, striped necktie, white shirt, haneoka school uniform