Reddit reviews Even Superheroes Make Mistakes

What are they interested in? Any particular favorite themes?

They might enjoy Even Superheroes Have Bad Days and the sequel that just came out, Even Superheroes Make Mistakes. I've also heard good things about Spark and the other books in the Tiny Tails series (more allegorical, about mythical animals learning to control their powers).

In terms of more didactic books about feelings, there are tons of good ones out there - The Color Monster, The Way I Feel, My Many Colored Days, and The Feelings Book are all nice simple choices to start with. I also love Visiting Feelings and the very silly How Are You Peeling?. Anh's Anger and My Magic Breath are about specific strategies for coping with big feelings. If they're fans of the Daniel Tiger TV show, there are a number of Daniel books about feelings such as How is Daniel Feeling?, I'm Feeling Mad, etc. You might also check out How to Be a Superhero Called Self-Control, which is not a picture book but sort of a handbook of emotional strategies for young kids framed as superpowers.

In terms of verbal requests more generally, if they're fans of Mo Willams definitely check out Time to Say Please and Crunch: The Shy Dinosaur. Goodbye Friend, Hello Friend might be another good one (though it just came out so I haven't actually read it yet). You might also check out the series by Elizabeth Crary which are sort of like choose-your-own-adventure social stories (kids get to decide how to respond to social situations and flip to the appropriate page to continue the story), such as I Want It or I Can't Wait. Not the most exciting stories, but kids seem to be intrigued by having the ability to change the ending. I keep waiting for someone to write a newer version, but haven't found anything else quite like them...

Anyway hope something in there is helpful! :)