Any novels with the 'villainess' MC, that changes the plot? Not necessarily on NU. RRL or any other site works well for me too

So, recently I read a bit of "Avoid the death route" and "Akuyaku Reijo ni nanka narimasen" and "Cloudy eyes Lilianne" translated by Shinsori and I kinda hunger for more of this type. So, what I need exactly is:

• A fluffy slice of life with many funny and heart-warming moments
• Innocent novel (No gore/killing/profanities)
• Good supporting characters that work with the MC and themselves while neither taking too much spotlight nor being too 2D.
• Spirits or divine beasts or... fairies? I dunno, just want fantasy stuff.
• The MC is a girl. Preferably a child (An adult woman behaving like a child is a bit..off-putting, not to mention males)
• The MC is born into a rich family (Kinda hard to bring out the fluff when the main can hardly take a shower, 'ascendance of a bookworm' kinda showed it to me)

If you got any novel that fits the requirements, please do give a suggestion.