Annie. Definitely a witch, probably a Hufflepuff. Very sweet yet also really clever, not the best in school but excels in one specific class. Gives her friends cookies when they're sad, probably has a few pet rabbits, has a reusable water bottle that's decked out in stickers. Cottagecore aesthetic? Seems super wholesome but actually has a pretty deep interest in dark and creepy stuff.
Her name's Lilianna, but she goes by Lili. You're actually very close with what she's like, and yes she is indeed a Hufflepuff. People like her a lot more than her brother and it's super easy for her to make friends. Definitely not the smartest but yes, she excels in Transfiguration. Is honestly the one who's sad most of the time, but will give cookies to sad friends. I think she's more of a cat person, but if she was in the modern world she would definitely have a decked out water bottle. I guess she does have a a slight cottagegore aesthetic. She is quite wholesome but is secretly super invested in the dark past of her mother's family.
Emilia. Rich af, but hates fancy stuff. Wears a lot of almost grunge clothing, lots of pins and buttons. Gets into a surprising amount of fistfights, but also sort of clumsy. Probably Christian based on the cross, but super chill. Says "duh" and "like" every other sentence but it's endearing. Cute but she Will Fight You.
You're kind of right about one thing. Her name is Cassiopeia, and she's super rich because of her dad. She's more invested in tech and is constantly cutting or burning herself, which is why she has a bunch of bandages on her fingers. She's a good fighter and is trained in combat, but tries not to get into them. She can be super clumsy but it's quite unlikely. Definitely not Christian or part of any religion - she just likes the aesthetic of the cross necklace. Picked up on swearing every other sentence from her dad and her dad's 'colleagues'. 'Cute But Will Fight You' is very much correct.