The best settings :

Euler a

Checkpoint : WAI-NSFW-illustrious-SDXL - V14

steps : 25

CFG : 5

Clip skip : 2

prompt : masterpiece, best quality, amazing quality, fine details, Shinobu Kocho, solo, breasts, medium breasts, short hair, black hair, purple hair, gradient hair, purple eyes, no pupils, hair ornament, butterfly hair ornamen,