Illustrious:

A LoRA weight of 0.9 works great, though you can adjust the strength as you prefer.

Prompts I usually used:

mireliaq-sh, purple hair, sidelocks, hair up, purple eyes, crown, red forehead jewel, earrings, detached collar, frilled collar, purple collar, brooch, purple dress, multicolored dress, gold trim, high collar, royal dress, puffy sleeves, long sleeves, grey shoulders, gold chestplate, layered dress, outfit1,

mireliaq-sh, purple hair, sidelocks, hair up, purple eyes, crown, red forehead jewel, earrings, red dress, royal dress, high collar, layered dress, outfit2,

mireliaq-sh, purple hair, sidelocks, hair up, purple eyes, crown, red forehead jewel, earrings, black bodysuit, ribbed bodysuit, armor, breastplate, pauldrons, gauntlets, armored dress, outfit3,

Pony:

A LoRA weight of 0.7 works great, though you can adjust the strength as you prefer.

Prompts I usually used:

purple hair, purple eyes, crown, purple dress, gold details, long sleeves, royal dress, high collar, puffy sleeves,

purple hair, purple eyes, crown, red dress, long sleeves, high collar, puffy sleeves, earrings,

SD 1.5:

A LoRA weight of 0.7 works great, though you can adjust the strength as you prefer.

Prompts I usually used:

purple hair, purple eyes, purple dress, royal dress, high collar, white puffy sleeves, long sleeves, crown, earrings

purple hair, purple eyes, armor, breastplate, armored dress, crown, earrings