Great for kids, and some (many!) adults. 
Perfect introduction to the theme of pronouns and gender identity, in a clear, easy to understand way, while not dumbing it down. 
Also many great resources at the end, would be especially helpful for guardians and educators. 

I voluntarily read and reviewed an advanced copy of this book. All thoughts and opinions are my own. Thank you to NetGalley and the publisher for an eARC.