There is not an aesthetic like this, you will just have to mix. You said that you don't know how, so May I provide some ideas?
Fairycore is very elegant, while kidcore is very childish. I would suggest lots of colors, stickers, and kiddie accessories (go to the decora page for some ideas)
Adventurecore is very similar to fairycore in the sense of they are both deeply involved in nature, so all you would have to do is make your fairy/kidcore outfits more practical. Some cargo pants with a pretty blouse, rainbow colored tunics, ect.
I'm sorry there isn't an aesthetic that fully relates to this, but I hope you can use this as a way to combine them. Hope this helps!