I feel like picky kids are all unique. It's really hard to predict what a kid would like.
I recently made this:
https://www.food.com/recipe/japanese-mums-chicken-68955
and served it to two somewhat picky 11 year olds.
One was like -- oooh it's sweet, and gobbled it up.
The other was like -- oh, it's unfamiliar (although she likes teriyaki, and fried chicken drumsticks) and pronounced it "Yuckytori"