Miriam was made by Asahi, so pick up the artist lora for extra authenticity. This bratty witch has a number of outfits, but due to limited data, it will probably get details wrong. If you notice a difference in the lora names in the example images, don't worry they should be more or less the same file. Now as for her appearance...

MiriTai, long hair, silver hair, blue eyes, pointy ears, large breasts, fangs,

For her height try short. "Shortstack" can make her a caricature. Another term works, but Civitai doesn't like it. Something about oppai and another word that I forgot. I took the generation data out of some example images because of it. As for her outfits...

Default Appearance: MiriDef, mob cap, ribbon, bowtie, long coat, buttons, striped gloves, elbow gloves, black gloves, blue gloves, black panties, striped legwear, black legwear, blue legwear, shoe bow

negative: skirt

Halloween: MiriHal, witch hat, long coat, purple gloves, orange shirt, bowtie, center opening, cleavage, frilled purple skirt, striped legwear, orange legwear, purple legwear,

The orange and purple colors are often swapped

Teacher: MiriSen, graduation cap, pink framed eyewear, pink frill trim, plaid shirt, cleavage, dark thighhighs, black footwear

Fairly innacurate in the details, sadly.

Swimsuit: MiriSwim, straw hat, hat bow, one piece swimsuit, frilled swimsuit, hip vent, plaid swimsuit, cleavage, sandals,

This gets pretty off-model and I again recommend the Asahi lora to compensate

Unfortunately there was not enough data on her Valentine's Day outfit to create anything resembling it accurately.

Her familiars, Kuro and Shiro, are in the data with their own tags. You can generate them (usually poorly), but I mostly put them in so that you could put their tokens in the negative section to prevent the generation of weird gremlins. Here are their tags:

mshiro, mkuro, bat wings, demon tail,