There are some dark children's books out there. Here are two more:
https://www.penguinrandomhouse.com/books/751689/i-am-wednesday-little-golden-book-by-golden-books-illustrated-by-golden-books/
https://www.penguinrandomhouse.com/books/742024/the-power-of-friendship-buffy-the-vampire-slayer-by-virginia-murphy-illustrated-by-pernille-rum/
