I'd pull back the Fowl series for a couple years. It's got complicated issues involving consent, imprisonment, and violence in those situations that might not be very easy to contextually for someone that young. I was advanced for a reader at that age, but I found a lot of enjoyment in the Redwall series. It had great worldbuilding and an interesting setting for a kid just about that age. They might be a little difficult to get them to actually sit down and read though, as they are definitely larger books for children.
It's hard finding kid appropriate content anymore, especially with relevance to wider literature influences. If you dont mind movies, have you considered Howard Lovecraft animated series?