Manana Nonomura from Chio's School Road
Keep in mind that settings may vary slightly between different versions. See below for more details.
When I tested this with different checkpoints and LoRAs, it seemed to work quite well.
Illustrious:
A LoRA weight of 0.8 works great, though you can adjust the strength as you prefer.
Prompts I usually used:
black hair, dark purple eyes, sidelocks, twintails, parted hair, forehead, school uniform, grey collar, black ribbon, blue skirt, pleated skirt, nose blush,