Any Archfey? I Would Like Some Advice

Oh hi Mark! I've been working on a personal project to improve my own homebrew skills and I would love some advise. Do you have any high CR archfey creatures for some inspiration?

Otherwise, could you take a look at what I have finished (its still very work in progress) and give me some pointers on how you design? Its a creature based on a vtuber I watch, and I plan on it being a two form boss-type that has a heavy magic form and a bulky-tank form. The magic one is the form I am struggling with the most, while the tankier one felt easier to design due to lack of spellcasting.

Keep up the good work!

The statblocks: https://homebrewery.naturalcrit.com/share/3rRX39TtU70I