Model not mine, all credit goes to novowels:

https://civitai.com/models/2524966/clementia-foerster-valkyria-chronicles-2-sdxl-lora-illustrious?mo

Tested at 0.8-1.0 strength.

Clip skip: 1

Trigger word is "vcfstr" and "black hair, very long hair, black eyes, messy hair" is required.

Add "glasses, lab coat, sleeves rolled up, black shirt, cleavage, midriff, black pants, sandals" for her typical look.