Owlboy #3: Tremble at the Terror of Zis-Boom-Bah
In the third Owlboy adventure, Billy must protect and defend the residents of Monstros City from a large Godzilla-like monkey-fish-beast that's prowling around. Meanwhile, back in his regular life aboveground, he has to hang out with his elderly great-aunt. Old people scare him more than giant gorillas - that is, until he makes a new old friend and realizes that age is nothing but a number.
These books are perfect for the elementary school crowd: they aren't too scary, they are plenty silly, and they have lots of crazy creatures. Kids will giggle at Thomas E. Sniegoski's writing, dig Eric Powell's comic-like illustrations, and have fun on Billy's adventures. I highly recommend the Owlboy books to kids and even adults, especially those who like superheroes, comic books, and funny stories.