Melty - The Rising of the Shield Hero / Tate no Yuusha no Nariagari
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.
Illustrious:
A LoRA weight of 0.9 works great, though you can adjust the strength as you prefer.
Prompts I usually used:
melty-sh, long hair, blue hair, long twintails, parted bangs, purple eyes, purple hair bow, blue neck ribbon, white collar, frilled collar, purple dress, white dress, multicolored dress, frilled dress, puffy sleeves, long sleeves, layered skirt, royal dress, white skirt, long skirt, outfit1,