Suzune Inukami from The Wrong Way to Use Healing Magic / Chiyu Mahou no Machigatta Tsukaikata
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:
long hair, black hair, bangs, blue eyes, school uniform, black jacket, red skirt,
long hair, black hair, bangs, blue eyes, white shirt, long sleeves, green trim, (white capelet), white shorts, black legwear, red ascot,
SD 1.5:
A LoRA weight of 0.7 works great, though you can adjust the strength as you prefer.
Prompts I usually used:
long hair, black hair, bangs, blue eyes, school uniform, black jacket, red skirt
long hair, black hair, bangs, blue eyes, white outfit, green trim, white shorts, black legwear