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

matsubarakanon, 1girl, solo, one side up, blue hair, long hair, skirt, bangs, shirt, hair ornament, frilled sleeves, short sleeves, flower, off-shoulder shirt, ribbon, looking at viewer, purple eyes, hair flower, frilled shirt, frills, hair ribbon, blue shirt, off shoulder, cslsk

School uniform Kanon:

matsubarakanon, 1girl, solo, one side up, blue hair, smile, long hair, ribbon, purple eyes, looking at viewer, bangs, dress, flower, school uniform, hair ornament, hanasakigawa school uniform, neck ribbon, long sleeves, buttons, light blue hair, sailor dress, red ribbon, brown dress, hair flower