Aoi Kanzaki from Demon Slayer / Kimetsu No Yaiba
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.
Pony:
A LoRA weight of 0.8 works great, though you can adjust the strength as you prefer.
Prompts I usually used:
black hair, short twintails, blue eyes, butterfly hair ornament, hair ornament, blue shirt, blue pants, white apron