Use weight at 0.9 or lower. Highly recommend using FastNegativeV2 embedding.

Base Trigger Words:

echidna, white hair, long hair, purple eyes, butterfly hair ornament, black dress, black capelet

Change Uniform, replace black dress, black capelet with uniform of your choice, i.e. maid:

echidna, white hair, long hair, purple eyes, butterfly hair ornament, maid

Trigger words/tags are not a must, you may mix and match to your preference.

All the sample are generated with upscaler 4x_foolhardy_Remacri.pth, just put it in "your_web_UI_folder/models/ESRGAN"