my niblings are 5 and 6 respectively. they like to read and be read to and I would like to get some books to help foster their enjoyment of reading as they grow up - so ideally stuff that’s not too challenging but still good for fostering young imaginations. obviously sneaky subversive themes are welcome - the sneakier the better, I kinda suspect their dad leans chud.
Robert Munsch (I really like Paper Bag Princess) is also good for solo reading for early readers)
If they’re strong readers and into fantasy, Deltora Quest series is a really great way for kids to get into epic fantasy, but it skews a little old for most 6 year old solo readers. Huge hit for the 8-10 crowd though
Same with Septimus Heap.
Roald Dahl was a bad dude, but Matilda and the BFG are still great books.